[tex]7.53 \times 1023 \: molecules[/tex]
Explanation:[tex] \: \: 1.25 \: mol \: bf3 \: contains \: 7.53 \times 1023 \: molecules[/tex]
Which use of land is most likely to result in erosion?
A. applying compost to soil to feed life
B. plowing fields parallel to a hillside
C. planting vegetation along a hill
D. leaving large stretches of land undeveloped
If magneium burn in oxygen, the ratio i 3 ma unit of oxygen to form 5 ma unit of magneium oxide. How many gram of oxygen are needed to react with 6 gram of magneium?
Answer: 4
Explanation:
Provide an orbital energy level diagram for the ground state of a nitrogen atom
An orbital energy level diagram for the ground state of a nitrogen atom is option A is correct.
What is energy level diagram?Energy level diagram is defined as a visual representation of the energies of an atom's or molecule's various orbitals. The energy shifts when it switches between energy levels or when it jumps to a different shell. As a result, a shell also indicates an electron's energy along with its location, and these are known as energy levels.
Seven electrons make up the atom of nitrogen. Let's write the orbital notation of the atom in order to build the orbital energy level diagram: 7 electrons of nitrogen:
1s² 2s² 2p³
Thus, an orbital energy level diagram for the ground state of a nitrogen atom is option A is correct.
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The plants received the same amount of sunlight and water each day. At the end of 30 days, Mary recorded the height of the plants (in centimeters) and the color of the leaves (green, yellow-green, yellow, or brown.)
1. In this scenario, what is the independent variable?
The leaves change within the season of spring,summer to fall
2. What is the dependent variable?
How the leaves change in time
3. In this scenario, what are the controlled variables? (Identify at least three.)
1. The green to brown leaves
2. The slow process of change
3. Nothing is bothering the leaves in the process of photosynthesis
4. Which group would be the control group in this experiment??
Fertilizer could be the independent variable in the plant experiment. Fertilizer will be applied to certain plants but not others. To study the impact on the dependent variable, the scientists alter the amount of the independent variable (fertilizer) (plant growth).
What independent variable includes in plant experiments?The amount of fertilizer applied would be the independent variable in a study examining the impact of various fertilizer dosages on plant growth. The plant's growth in height or mass would be the dependent variable.
Therefore, The experimenter manipulates or modifies the independent variable, which is thought to have a direct impact on the dependent variable.
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to what volume should you dilute 30 ml of a 12 m h2so4 solution to obtain a 0.15 m h2so4 solution?
The volume will be 2400 ml.
The equation used here will be
M1 × V1 = M2 × V2
M1 = initial concentration
M2 = final concentration
V1 = initial volume
V2 = final volume
So according to the data;
M1 = 12m
M2 = 0.15m
V1 = 30ml
V2 = ?
By putting the values in the equation as follows;
M1 × V1 = M2 × V2
V2 = M1 × V1 / M2
By putting the values given in the question we will solve this question as follows
V2 = 12 × 30 / 0.15
V2 = 360 / 0.15
So the volume used will be;
V2 = 2400 ml
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The sodium-potassium pump functions to pump
sodium ions out of the cell and potassium ions into the cell.
sodium ions into the cell and potassium ions out of the cell.
sodium and potassium ions into the cell.
sodium and potassium ions out of the cell.
sodium and potassium ions in both directions across the cell membrane.
The sodium potassium pump helps in maintaining the acid-base balance of the body and helps in proper kidney function.
Explain about sodium-potassium pump:Operation sodium-potassium pump of moves sodium ions out of the cell and potassium ions into the cell. When a cell membrane moves molecules or ions against a concentration gradient or against an electrical or pressure gradient, the process is called active transport. Different substances that are actively transported include:
--> sodium ions,
--> potassium ions,
--> calcium ions and
--> some amino acids.
There are two types of active transport which are divided according to the energy that is used to cause the transport. They include:
--> primary and
--> secondary active transport.
PRIMARY ACTIVE TRANSPORT
A typical example is the SODIUM-POTASSIUM PUMP( Na+ - k+). This is a transport process that pumps sodium ions outward through the cell membrane of all cells and at the same time pumps potassium ions from the outside to the inside. This pump helps to:
--> maintain the sodium and potassium concentration differences across the cell membrane
--> establish a negative electrical voltage inside the cells.
The mechanism or operation of the pump involves the following steps:
--> two potassium ions bind on the outside of the carrier protein and three sodium ions bind on the inside.
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What effects does a dysfunctional nervous system have on other systems of the body? Provide at least one specific example.
Considering the nervous system is the "control center" of the human body, without a functioning nervous system, there would be no way for signals to reach other organ systems in the body. An example of this can be seen with the muscular and skeletal systems. If the brain is unable to send out signals to these two organ systems, then they would cease to move or even stand up straight. Say if you were to break your spinal cord, there would be no way for the brain reach your leg muscles because the nerves in your spine are now damaged and can therefore not carry out signals from the brain.
Fermentation is a chemical reaction that occurs in the. Because it is , fermentation oxygen. Compared to cellular respiration, lactic acid fermentation generates atp and is less efficient.
A chemical reaction that normally occurs in the cytoplasm of both prokaryotic and eukaryotic living cells is known as fermentation.
An anaerobic reaction is a biological or chemical process that doesn't need oxygen, such fermentation and glycolysis.
As a result, since fermentation is anaerobic, oxygen is not needed.
Lactic acid fermentation produces significantly less adenosine triphosphate (ATP) and is less effective than cellular respiration.
More high-energy intermediates that can be oxidized to produce adenosine triphosphate (ATP) are produced during cellular respiration than are produced during lactic acid fermentation.
In comparison to cellular respiration, lactic acid fermentation is often less effective and generates significantly less adenosine triphosphate (ATP).
As a result, the following phrases/words are the most suitable and accurate to fill in the blanks:
1) cytoplasm
2) Anaerobic
3) Does not require
4) Much less
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Roxanne was asked by her teacher to explain why sodium ions (na+) and chlorine ions (cl-) combine into sodium chloride (nacl). Roxanne said it was because chlorine is highly electronegative and sodium has a low ionization energy. What else could she include in her explanation?.
She could say, "Tons with oppositely charged of Cl- and Na+ are electrical attracted to each other," in her explanation.
Na+ is a sort of ion, right?The main extracellular cationic and solute is sodium ion (Na+), which is crucial for the production of nerve impulses in cardiac and neurological tissue.
What function does Na+ serve?The predominant cation in extracellular environment is the sodium ion (Na+). Na+ can function as an essential intracellular second messenger upon entry into the cell, regulating a variety of cellular processes. Recent research has demonstrated that extracellular Na+ can play a significant signaling role in the up-regulation of Command is executed.
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Analyze the weather map. Which of the following best describes the weather in Olympia, Washington (where the black arrow is pointing)?
A. high - pressure system and a warm weather front
B. high - pressure system and a cold weather front
C. low - pressure system and a cold weather front
D. low - pressure system and an occluded weather front
(Please help it's a TGA)
Answer: low - pressure system and a cold weather front
Explanation: because if you look at the map on where the black arrow is pointing you will see blue triangles that indicates a cold front and you will also notice that there is a big red L that L means low pressure, therefore the answer is low - pressure system and a cold weather front. please correct me if i'm wrong. ( i also just finished this same TGA in k12 and this was the answer)
i really hope this helps and have a great day.
A weather map, commonly referred to as a synoptic weather chart, shows different meteorological features across a certain area at a particular time and contains different symbols with different meanings.
What is Weather map ?The Weather Map is a weather forecaster's fundamental tool. The distribution patterns of atmospheric pressure, wind, temperature, and humidity at various levels of the atmosphere are shown on the weather map.
Weather maps depict what the weather will be like in a specific location today and over the next few days.A chilly weather front with a low-pressure system.The answer is a low-pressure system and a cold weather front because if you look at the map where the black arrow is pointing, you will see blue triangles that indicate a cold front and you will also note that there is a big red L that L means low pressure. If I'm mistaken, kindly correct me.To know more about Weather map please click here ; https://brainly.com/question/26255452
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when 0.1 mol of a is mixed with 0.1 mol of b in the reaction chamber and the reaction runs to completion, the 1500 ml of water in the calorimeter heats up from 24.2°c to 25.9°c. what is δh° for the reaction in kj/mol?
Water has a 4.18 J/g specific heat capacity at 0 °C. Since 1500 ml of water weighs 1500 g, the enthalpy change for a 24.2 to 25.9 degree Celsius temperature difference is 10659 per mole or 1065.9 for 0.1 mol.
Describe calorimetry.Calculating a reaction's enthalpy change analytically is called calorimetry. Given by, is the calorimetric equation that links mass, temperature difference, and specific heat capacity (c).
q = mc ΔT
given that the water has a 1500 ml capacity. Since water has a density of 1 g/ml, its mass is 1500 g. Water has a specific heat capacity of 4.18 J/°C g. Therefore, the following formula is used to compute the thermal energy of the reaction:
q = 1500 g × 4.18 J/ °C g × (25.9 - 24.2 °C)
= 10659 J/mol
Hence, for 0.1 mol 10659 × 0.1 = 1065.9 J is the heat energy change for the reaction.
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which pair of atoms forms the most polar bond? which pair of atoms forms the most polar bond? n and o n and f p and f p and o
The most polar form is made up of the elements phosphorous and fluorine. P-F because P(EN 2.19) and F(3.98) have higher electronegativity differences than N(EN 3.04) and F. (3.98).
The more polar the disparity, the greater it is.The bond that phosphorous forms with fluorine will be the most polar of all those mentioned because nitrogen is one of the most electronegative elements in the periodic table. Orbitals collide to form bonds, which can be classified as polar or nonpolar depending on their polarity. They are regarded as an ionic and covalent link in accordance with Fajan's rule, which explains the ionic and covalent character in a bond between two atoms. The difference in electronegativity between the two atoms that make up a bond determines its polarity. A nonpolar covalent bond will form between two atoms if their electronegativity is essentially the same.
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Click oil basics and use the information to complete this passage that discusses how plastic production affects society.
the production of plastics makes life____, so it benefits society. on the other hand, the production of plastics causes land and water____, so it also harms society.
Easier and pollutuion are correct answer of this question . Click oil basics and use the information to complete this passage that discusses how plastic production affects society.
What is Pollution?
Pollution, also known as environmental pollution, is the addition of any material (solid, liquid, or gas) or energy (such as heat, sound, or radioactivity) to the environment at a rate greater than it can be dispersed, diluted, decomposed, recycled, or stored in an innocuous form. The three basic sources of pollution—air, water, and land—are frequently categorised according to their effects on the ecosystem. Modern society is also concerned about certain types of pollution, such as plastic, light, and noise pollution. The environment, wildlife, and human health are all routinely negatively impacted by pollution of many forms.
Therefore, pollution can be defined simply as something that contaminates the environment. Pollution is the presence of dangerous compounds in the air, land, and water that can harm both living things and the environment. referring to dangerous substances that are released or brought into the environment, such as hazardous gases, liquids, or other poisonous materials. Pollutants, contaminants, or dangerous chemicals are other factors that contribute to the environment's unsuitability or safety, as are poisonous materials that contaminate the soil and the air. Pollution is another unavoidable side consequence of actions that disturb the ecosystem's biodiversity. Additionally, it jeopardises the environment's ability to endure.
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a certain stable nuclide, after absorbing a neutron, emits an electron, and the new nuclide splits spontaneously into two alpha particles. identify the nuclide.
certain stable nuclide, after absorbing a neutron, emits an electron, and the new nuclide splits spontaneously into two alpha particles. the nuclide.37 X
What are a nucleon and a nuclide?
Summary. Nucleons are the protons and neutrons that make up the nucleus. An atom with a certain number of protons and neutrons is referred to as a nuclide. When an unstable nucleus spontaneously decays, it becomes radioactive, and the emissions it produces are collectively referred to as radioactivity.
ZA
X+01
x→2 24
α+ −10 β
∴Z+0=4−1=3
A+1=8
∴
37 X
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what kind of problems can you foresee if every speck of carbon were turned into biomass? why?
Since there wouldn't be sufficient carbon in the environment for plant to carry out biological processes, life would die.
Who or what makes up carbon?The nucleus of a carbon atom is made up of six protons and six neutrons, and it is encased in six electrons. According to quantum physics, the first two electrons must occupy the innermost atomic orbital, while a wavefunctions of the following four electrons only partially fill the secondary standard and 3-second principal orbitals.
What products uses carbon?Coal, methane gas, & crude oil are all utilized as fuels. It is employed to create a wide range of products, including polymers and steel alloys. Even black ink for printing and painting is produced with it.
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The formula of a base is written by showing the number of hydrogen ions needed to balance the positive charge on the cation. True or false
By indicating that the number of hydrogen ions required to balance the positive charge on the cation is True, the formula for a base can be written down.
In terms of H+ ions, what is a base?The hydroxyl ions (OH-) produced will mix with any hydrogen ions (H+) in the solution to generate water molecules (OH- + H+ = H2O), therefore we can also define a base as a substance that receives or accepts hydrogen ions (H+) that are already present in the solution.
A cation or an anion, is hydrogen?Hydrogen is an alkali metal with one electron in the outermost shell. It loses one electron to create a cation, H+, much like alkali metals.
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as the atomic number for elements on the periodic table increases, the number of electrons in neutral atoms of the elements______.
What is mAngleMHJ?
A boron atom contains 6 neutrons. This isotope of boron will have
protons and a mass number of
Answer: 5 and 11
Explanation:
protons= 5
neutrons=6
mass number= 6+5=11
if the total atmospheric pressure is 1 atm, and it suddenly drops to 10% oxygen, then can you survive?
The option C , Yes ,if you hurry up and adapt (acclimate) within 2 minute holding your breath is correct answer.
The right amount of oxygen in blood is important. Too little oxgen and much oxgen are both harmful to health. Therefore, the body ciontrols and regulatesthe amount of oxygen in blood at all times ,and the levelof oxygen in blood drops too low , the condition is called hypoxemia.
The option A, say sudden drops (10%) of oxygen is not sustainable, it is wrong because of the decrease of oxgen level it create the breathning problem.
The option B,yes there is still lots of oxygen around, this option is correct the oxygen variation made many heath issues,but the option C is good answer for this question.
Option A is corect, countercurrent exchnge,,the two fluid moves in opposite direction with different heat,the maximum amount of heat transfer that can be obtained is higher incountercurrent, The countercurrent exchange is most suitable for urine purification,
Option B ,is wrong Concurrent exchange is two fluids moves in same direction it not gives 100%f freshwater
Urine treatment ; Heating the urine to evaporate the water and leaves the salt behind. The water vapor would then move to a condenser and be condensed as purified water .The salt remain, forming a brine solution with some of the remaining water. The brine would have to be recovered or thrown away periodically. this process would requires a lot of power to heat all the water boiling and to then cool the water vapor sufficiently to condensed it.
Option C: wrong Reverse osmosis.Using high pressure cross a very fine fitter or membrane to purify water.The water is separated from the salt Brine is created from the concentrated salt that have to be recoveredor periodically thrown away. This technology is often used in aridregion to convert and purify sea water into portable water.
Hence the option C is correct
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In what industries are electron microscopes used today?
Explain
Answer:
Aeronautics, automotive, apparel, and pharmaceutical industries.
Explanation:
Other industries that may commonly use electron microscopes as a part of their production process include aeronautics, automotive, apparel, and pharmaceutical industries. Electron microscopy can also be applied in industrial failure analysis and process control of diverse industries.
when the elements are arranged in order of increasing number of protons, certain sets of properties recur periodically. true or false
True, According to Mendeleev's periodic table when atoms are arranged in increasing no. of atomic mass some properties recur periodically, which later changed to the modern periodic law.
What is a Modern Periodic Table?According to the contemporary periodic law, an element's physical and chemical characteristics are periodic functions of its atomic number.
From left to right across each row, scientists organized elements in increasing order of their atomic numbers. and found that items with identical features recur at predictable periods.
Thus, according to modern periodic law when elements are arranged in increasing order of atomic no. certain physical and chemical processes. recur periodically.
True, According to Mendeleev's periodic table when atoms are arranged in increasing no. of atomic mass some properties recur periodically, which later changed to the modern periodic law.
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Anlamadim yardım edin acil
Can u put the question in english
alkenes can be used as substrates in polymer synthesis. consider cationic polymerization and determine which substitution pattern would be the best substrate?
Cationic polymerization is a form of chain-growth polymerization used in chemistry, in which a cationic initiator charges up a monomer before it reacts.
What are they Cationic and anionic polymerization?The two different forms of chain-growth polymerization reactions utilized to create various types of polymers are anionic polymerization and cationic polymerization. Both of these reactions have the same reaction mechanism, however they have distinct reaction initiators.
What separates cationic from anionic substances?Ions with a positive charge are called cations . Anions are negatively charged ions that have gained one or more electrons, resulting in having more protons than electrons.
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in blood plasma, ph is maintained by the carbonic acid-bicarbonate buffer system. how is ph maintained when acid or base is added to the buffer system?
The blood interacts with the bicarbonate, C03²-, from the acid to balance it when acid is supplied to the blood buffer system.
How does a buffer system operate and what does it mean?A buffer is a substance that can withstand a pH shift when acidic or basic substances are added. Small additions of acid or base can be neutralized by it, keeping the solution's pH level largely constant. For procedures and/or reactions that call for certain and stable pH ranges, this is significant.
Give an example of what a buffer system is.Buffer solutions can resist the pH change when a strong acid or base is added sparingly. A strong acid and also its salt can be used as a buffer. It is a mixture of sodium acetate and acetic acid, CH3COOH + CH3COONa.
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6. how does a non polar column separate mixture of compounds and how does a polar column separate mixture of compounds
The capacity of stationary phases used in high performance liquid chromatography (HPLC) to distinguish between polar column and nonpolar chemicals can be used to classify them.
In HPLC, how do you distinguish polar compounds?Extremely polar chemicals, which are difficult to separate under reversed-phase conditions, can be retained and separated successfully using hypercarb columns. This application has shown that: Polar chemical retention is good in hypercarb columns. The techniques created on Hypercarb columns are solid.
How can you distinguish between polar and nonpolar bonds?(We define a bond to be polar if there is a difference between the electronegativity of the atoms in the bond that is more than 0.4. The bond is effectively nonpolar if the difference in electronegativity is smaller than 0.4.) The molecule is nonpolar if there are no polar bonds.
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how many milliliters of 10.5 m hcl(aq)10.5 m hcl(aq) are needed to prepare 205.0 ml205.0 ml of 1.00 m hcl(aq)?
The milliliters of 232 quantity of HCl required for preparing 1M HCl.
The fact that water has a concentration of 10-7 for both hydronium and hydroxide must be taken into account when the concentration of acids very close to or less than 10⁻⁷.
We frequently overlook the ion concentration in water for the same reason that we frequently ignore the mass of electrons (we just add the protons and neutrons), which is that they are so minute. For taking the -log conc, there is an exception in this case.
M1 * V1 = M2 * V2
10.5 * V1 = 1 * 740
V1 = 70.48 ml
Initial moles of solute are calculated as follows: molarity * volume in liters = 12 * (61/1000) = 0.0732 moles.
The 238 ml of solution now contains these moles.
0.0732 moles are present in 238 ml of solution.
Therefore, 119 ml of solution will contain = 0.0732 * 119 / 238 = 0.0366 moles of solute.
As of right now, the solution's total volume is 119 /113 = 232 ml, or 0.232 liters.
Final concentration is equal to moles divided by the volume in liters, or 0.0366/0.232, or 0.158 M.
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for each acid-base reaction, determine whether the equilibrium favors the starting materials or the products. click on the side of the reaction, which is favored.
Stronger/stronger weaker/weaker is indeed the reaction that is energetically preferred because acids and bases are conjugates, where the stronger acids is on the same side as that of the stronger base.
Equilibrium inside an acid-base reaction favors what?In acid-base processes, equilibrium is always in the favor of the weaker side.The pKa values for the compounds functioning as acids are displayed beneath their structures in the example below.Because the weaker acid and base are on the left, equilibrium is in the favor of the left.
How is the path of an acid-base balance determined?Finding the pKa for the acid on the left and deducting it from it allows us to utilize our pKa values to anticipate the point of equilibrium.
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Seeds are a derived character of the spermatophytes. All of the plants in this clade reproduce using seeds. However, embryo formation is also a trait of the spermatophytes. Do you think true water-conducting tissue is a derived character of either embryophytes or green algae? why or why not?.
Neither green algae nor embryophytes have a developed characteristic of having tissue that conducts water.
Embryophytes and aquatic "green algae" make up the majority of green plants.
Non-vascular plants lack the xylem and phloem that make up a vascular system.
Green algae are unable to grow as tall as the majority of vascular plants because they lack lignified water-conducting tissues.
What is xylem?
The vascular tissue is absent in green alge, which are divided into various unrelated families.
The majority of scientists believe that the xylem's real water conducting tissue is green. The tissue of the plant's vascula transports water and dissolved minerals from the roots to the rest of the plant while also offering structural support.
Tracheary elements are a general term for a variety of specialised water conducting cells found in xylem tissue.
Therefore, Green algae and embryophtes cannot be considered as both since they lack the xylem, a water-conducing tissue, and as a result cannot be both.
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at very high pressures, which interactions between gas molecules contribute most to nonideal behavior?
The actual gases display intermolecular forces of attraction. the gases cannot act perfectly. Due to the gas molecules' near proximity to one another under high pressure, attraction forces begin to develop between them.
What leads to an imperfect solution?There are two ways that non-ideal solutions might form: the intermolecular interactions between the molecules of the solute and the solvent are weaker than those between molecules of similar (of the same kind) molecules. the intermolecular forces between molecules are stronger than the forces between molecules that are comparable.
What is the result of high pressure natural gas compression known as?The fuel gas known as CNG (compressed natural gas) is compressed to less than 1% of the volume it would have at normal atmospheric pressure. It is distributed and kept at a pressure of 20–25 MPa in rigid containers.
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it takes to break a carbon-carbon double bond. calculate the maximum wavelength of light for which a carbon-carbon double bond could be broken by absorbing a single photon.
The energy required to break one mole of the C-C bond is 348 kJ and the maximum wavelength is 3.44 X 10⁻⁷ m.
Thus, the amount of energy needed to break one C-C bond is given as,
348 x 1000 / 6.023 x 10^23
Required energy is 5.78 x 10^-19 Joules.
The relationship between wavelength and energy is given as,
E = hc / λ
Where,
wavelength is λ
Planck's constant is h.
the speed of light, is c
Substitute the values in the expression to obtain the value of λ,
5.78 X 10⁻¹⁹ Joules = 6.62 X 10⁻³⁴ X 3 X 10⁸ / λ
λ = 3.44 X 10⁻⁷ m
The highest wavelength of light at which a single photon may break a carbon-carbon single bond is 3.44 X 10⁻⁷ m.
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