Using a broom to clean sidewalks and driveways is a way to reduce water pollution.

Answer:

the answer is c

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Explanation:

No visible reaction is observed when starch reacts with cold concentrated tetraoxosulphate (vi) acid​

We know that starch is a poly saccharide. We know that a poly saccharide is composed of so many monomer units. In this case, the starch is a polymer that is composed of glucose units that are joined together by glyosidic linkages to form very long polymer chains.

All the reactions that occur between starch and concentrated tetraoxosulphate (vi) acid​ do occur when the mixture is heated. There is no  cold phase reaction that occurs between starch and concentrated tetraoxosulphate (vi) acid​.

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Answer:

It increases

Explanation:

The atomic radii increases because you are adding more shells/electrons

Sucrose has the molecular  C₁₂H₂₂O₁₁ . if a sucrose sample contains 9.0x10²⁴ atoms of hydrogen, There are 1.4370 x10²⁶ molecules of sucrose are present in the sample.

Sucrose C₁₂H₂₂O₁₁ contain  C₁₂H₂₂O₁₁  Hydrogen

First we should how how many percentage of hydrogen in sucrose

The following formula will be used to determine the percentage of elements present in a molecule:

(Mass of Element / Mass of Molecule) / 100 equals the percentage of an element.

Sucrose's molecular weight is.

= (12)12 + (1)22 + (16)11, 

where 12 is the mass of an atom of carbon.

Hydrogen's atomic mass is 1, thus.

16 = Oxygen Atomic Mass

mass sucrose = 144 + 22 + 176

mass sucrose = 342 g/mol

% of H  =  (22 / 342) ×100    =  6.43 %

to calculate how many molecules sucrose are present we can compare percentage of hydrogen to % sucrose

 % hydrogen         =         % sucrose            

atom hydrogen           molecules of sucrose

6.43 %        =              100%              

9.0x10²⁴          molecules of sucrose    

molecules of sucrose    = 1.4370 x10²⁶ molecules

Therefore,  There are 1.4370 x10²⁶ molecules of sucrose are present in the sample.

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(a)The pH of the fruit juice solution is approximately 3.5. (b) The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(b)The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(a). The hydrogen ion concentration of the fruit juice is 0.0003 mol/L. We can determine the pH of the solution using the formula pH = -log[H⁺].

pH = -log(0.0003)

pH ≈ -log(3 × 10⁻⁴)

Using a calculator, we can calculate the logarithm:

pH ≈ -(-3.5229) (rounded to the nearest tenth)

pH ≈ 3.5

Therefore, the pH of the fruit juice solution is approximately 3.5.

(b). A tomato has a pH of 3.0. We can determine the hydrogen ion concentration of this solution by rearranging the formula pH = -log[H⁺] to solve for [H⁺].

[H⁺] = 10(-pH)

[H⁺] = 10⁻³

[H⁺] = 0.001 mol/L

Therefore, the hydrogen ion concentration of the tomato solution is 0.001 mol/L.

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One method of obtaining these nutrients from the shrub is through the branches of the Dodder plant penetrating the tissues of the shrub. This is an illustration of a partnership in which only one creature benefits.

Tissue is a collection of cells with a common structure and function that work as a single unit. The brain give it shape and help it retain heat and energy. ibrocartilage, epithelial tissue, muscle tissue, and nervous tissue are the four different types of tissues.

Your organism is made up of cells, and tissues are created when groupings of cells carry out similar tasks. Your body consists mostly of four different tissue types: connective, epithelial, muscular, and nervous tissue. Organs are cushioned and joined together by connective tissue. The skin's outer layer is made up of epithelial tissue.

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Answer:

i'm attaching the report i made

Explanation:

(It does include the chart information)

hope this helps! have a wonderful day :)

The solubility of a solid solute increases with temperature.

The solubility of a solute is the amount of solute that dissolves in a given volume of solvent at a particular temperature.

The solubility of a solute increases with increase in temperature.

Based on the lab results, it was seen that with increase in temperature, the mass of sugar that dissolves in water increases.

50 mL of water at 2 °C dissolved only 80 g of sugar whereas at 102 °C, 250 g of sugar dissolved.

Therefore, it can be concluded that solubility of a solute increases with temperature.

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The value of Y in the formula when 2.8g of silicon react with 3.2g of oxygen, is 2

The numbers in the formula of a compound determine the ratio of moles of each element in the compound.

Given:

2.8g of silicon

3.2g of oxygen

[relative atomic mass of silicon is 28 and of oxygen is 16]

For silicon, n = 2.8 ÷ 28 = 0.1    (n= moles)

For oxygen, n = 3.2 ÷ 016 = 0.2

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.1 moles.

For Silicon = 0.1/0.1 = 1

For Oxygen = 0.2/0.1 = 2

Taking the mole ratio as their subscripts.

The ratio of Si:O is 1:2

SiO\(_{2}\) is the formula of silicon dioxide.

The value of y in the formula SiO\(_{Y}\) is 2 when 2.8g of silicon react with 3.2g of oxygen.

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In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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Answer:

Explanation:

The smallest atom on the periodic table is helium, He, and has a radius of 31 pm. Yeah, He is even smaller than hydrogen, H, which is 53 pm. Which atom is the largest? That would be cesium, Cs, which comes in with a radius of 343 pm. ^^

Glycinate donates an electron pair so it is a bidentate ligand.

The molecular formula is C₂H₄NO₂⁻. The octahedral complex is formed between glycinate molecules and cobalt(III) and the stoichiometry of the complex is [Co(gly)₃]. The reaction is as follows;

Co₃⁺(aq) + 3C₂H₄NO₂⁻ ⇒ [Co(C₂H₄NO₂⁻](aq)

A cobalt complex is formed when 3 glycinate ions equivalents react with one Co₃⁺ ion equivalent so, it is necessary to keep the glycinate ions concentration greater than the cobalt(III) ions at least three times more.

So, taking the concentration 4 times greater can facilitate the reaction.

For a complex whose concentration is 0.015M, 0.06M glycinate ions are required to obtain the desired cobalt(III) glycinate complex.

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The amount of chemical product, y, at a distance of x = 1 is given by y = -ln(-(1/2) ln|3| + C3), where C3 is a constant.

The given differential equation is dx/dy = e^(-y)(2x+1), where y represents the amount of chemical product and x represents the length across the reactor.

i. To find the particular solution for y, we need to solve the given differential equation. Let's separate the variables and integrate both sides with respect to x and y.

dx/(2x+1) = e^(-y) dy

Integrating both sides, we get:

∫ dx/(2x+1) = ∫ e^(-y) dy

To integrate the left side, we can use the substitution u = 2x+1. This gives us du = 2dx, which implies dx = du/2.

∫ dx/(2x+1) = ∫ (1/u) (du/2)

= (1/2) ∫ du/u

= (1/2) ln|u| + C1, where C1 is the constant of integration.

= (1/2) ln|2x+1| + C1

Integrating the right side:

∫ e^(-y) dy = -e^(-y) + C2, where C2 is the constant of integration.

Now, equating both sides and simplifying:

(1/2) ln|2x+1| + C1 = -e^(-y) + C2

Rearranging the terms:

e^(-y) = -(1/2) ln|2x+1| + C3, where C3 = C2 - C1.

Taking the natural logarithm of both sides:

-y = ln(-(1/2) ln|2x+1| + C3)

y = -ln(-(1/2) ln|2x+1| + C3), where C3 is a constant.

ii. To find the amount of chemical product, y, at a distance of x = 1, we substitute x = 1 into the particular solution obtained in part i.

y = -ln(-(1/2) ln|2(1)+1| + C3)

Simplifying further:

y = -ln(-(1/2) ln|3| + C3)

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Answer:

Fluorine

Explanation:

fluorine is the element in question, as its atomic number is 9

So,

First of all, there are too many types of intermolecular forces:

1. Dispersion forces: London dispersion force is a weak intermolecular force between two atoms or molecules in close proximity to each other. The force is a quantum force generated by electron repulsion between the electron clouds of two atoms or molecules as they approach each other. Every molecules have this kind of force.

2. Dipole: Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. They are much weaker than ionic or covalent bonds and have a significant effect only when the molecules involved are close together (touching or almost touching).

3. Hydrogen-bonding: Hydrogen bonding is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.

Let's begin with hypobromous acid (HBrO).

HBrO is a compound that can form Hydrogen bonds since there's a hydrogen atom bonded to an Oxygen atom.

This compound also presents dispersion forces since atoms are close to each other.

And, there's also dipole-dipole forces because as you can see, there's a positive end (H+) and a negative end (BrO-).

Now, let's analyze SiH4:

SiH4 is composed of molecules, for which the only intermolecular forces are London dispersion forces.

There's no Hydrogen Bonding because Hydrogen can't bond to a very electronegative element such as O, N or F.

As you see, Si is not a very electronegative element.

And, there's not dipole-dipole forces because there's not a positive or a negative end. In this compound, H and Si share all their electrons but there's not any charges when they are close together.

Let's check now Oxygen difluoride (OF2):

As you can notice, London dispersion forces are present in all compounds, so, this is the first force identified.

Now, there's not Hydrogen, so, this molecule can't form Hydrogen-Bonds with itself.

If we look at the dipole-dipole forces, we can clearly notice that OF2 is a bent polar molecule. That means that it actually has this kind of force.

And, finally, carbon monoxide (CO):

Because CO is a polar molecule, it experiences dipole-dipole attractions.

We also know that there's London dispersion forces.

There's no Hydrogen Bonding in this molecule.

Answer:

1: A skater would begin with energy when he hopped on his skateboard at a skate park. Nevertheless, when he walks, the power is turned into sound energy rather than annihilated.

2. A leaf converts radiant energy into sugars and carbohydrates through a process known as photosynthesis. This is an everyday example of energy transformation.

3. The type of energy we might consider brightness is radiant energy. The sun is a prime example of radiant energy.

4. Chemical energy is the type of energy that is naturally present in food and chemicals.

5. A leaf employs photosynthesis to convert radiant energy into sugars, which is one method in which radiant energy is converted into chemical energy.

6. The energy that propels motion is mechanical energy. It is the total of kinetic and potential energy. I think I relocated my dog, Holly, the last time I utilized mechanical energy.

7. The form of energy that humans can hear is sound energy. I can hit my foot as I type, listen to music or type.

8. The movement of charge is electrical energy. Thermal energy is represented by the rapid movement of atoms, whereas electrons flow. The atoms or electrons in a circuit accelerate really quickly. As a result, some electrical energy is converted into heat energy.

9. the conversion of mechanical energy to chemical

Scientific models are used to simplifies complicated concepts and problems and make it easy to interpret and understand. Complex natural phenomenon can be visualized using scientific models.

Scientific models are used to visually represent or mathematically solve complex phenomenons and real world problems. There are different kinds of models such as mathematical models, still model, dynamic models etc.

These models are designed with well advanced planning and they might be difficult to reconstruct once damaged. Natural processes, organic systems, complex molecular structures etc. can be easily understood using models.

The law of conservation of energy states that, energy can neither be created nor be destroyed. Thus total energy is conserved. However, energy can be transformed from one form to the other.

For  instance, in light bulbs electrical energy is converted to light energy. Similarly in nuclear power plants , nuclear energy is converted to electrical energy.

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The mass of AgBr produced from 22.5 L of AgNO₃ is 50.01 gram

Mass is a measure of the amount of matter in a substance or an object.

Here given reaction is stoichiometric

From the balanced equation for the reaction si

2AgNO₃ + MgBr₂ → 2AgBr + Mg(NO₃)₂

The mole ratio of AgNO₃ and AgBr is 2 : 1

Mole of 22.5 g AgNO₃ = 22.5/169.87

Mole of 22.5 g AgNO₃ = 0.1325 mole

Equivalent mole of AgBr = 0.265 mole

Mass of 0.265 mole AgBr = 0.265×188.77

Mass of 0.265 mole AgBr = 50.01 gram

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The electrostatic potential energy between an electron and a proton that are separated by 53pm is 4.27 × 10^-18 J.

The electrostatic potential energy between two charged particles can be calculated using the

formula U = k*q1*q2/r,

where:

k is the Coulomb constant,

q1 and q2 are the charges of the two particles, and

r is the distance between them.

In this case, we have q1 = -1.60*10^-19 C (charge of the electron), q2 = 1.60*10^-19 C (charge of the proton), and r = 53 pm = 5.3*10^-10 m. Plugging these values into the formula, we get:

U = (8.99*10^9 N m2/C2)*(-1.60*10^-19 C)*(1.60*10^-19 C)/(5.3*10^-10 m)

U = 4.27 × 10^-18 J

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NaOH.

Na = Sodium which is in group 1 of periodic table which are alkaline metals. all the others are alkaline earths as they are all in group 2.

The degree of dissociation of a 0.010 M solution of boric acid is approximately 0.9996.

The expression for the ionization constant of boric acid can be written as;`H3BO3 + H2O <=> H3O^+ + H2BO3^-`Now, let us put the initial concentration of boric acid equal to `C` and the degree of dissociation of boric acid is `α`. Consequently, the equilibrium concentration of boric acid is `C(1-α)` and the equilibrium concentration of hydrogen ions is `αC`.The equilibrium concentration of hydrogen ions and hydrogen borate ion can be written as `αC` and `(C - αC)`, respectively.So, Ka can be defined as;`Ka = (H3O^+)(H2BO3^-) / (H3BO3)`On substituting the concentrations, we obtain;`3.8×10^-10 = (αC)(αC) / (C - αC)`Now, let us rearrange the equation, as given below;`α^2C^2 - (Ka)C + 0.0 = 0`By solving this quadratic equation, we obtain;`α = (√[(Ka)^2 + 4Ka] - Ka) / 2`On substituting the values, we get;`α = (√[(3.8×10^-10)^2 + 4(3.8×10^-10)] - 3.8×10^-10) / 2 = 0.9996`Therefore, the degree of dissociation of a 0.010 M solution of boric acid is approximately 0.9996.

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the pH of the solution is approximately 8.77.

First, calculate the moles of pyridine and HCl:

Moles of pyridine = 0.050 L × 0.20 mol/L = 0.010 mol

Moles of HCl = 0.035 L × 0.15 mol/L = 0.00525 mol

Next, determine the concentration of the resulting solution:

Total moles of pyridine + HCl = 0.010 mol + 0.00525 mol = 0.01525 mol

Total volume of solution = 50.0 mL + 35.0 mL = 85.0 mL = 0.085 L

Concentration of the resulting solution = 0.01525 mol / 0.085 L ≈ 0.1794 M

Using the equilibrium constant (Kₐ) for pyridine (1.7 × 10⁻⁹), we can set up the expression:

Kₐ = [H₃O⁺][C₅H₅N] / [HC₅H₅N]

Assuming x is the concentration of [H₃O⁺], we have:

1.7 × 10⁻⁹ = x × 0.1794 M / 0.1794 M

Solving for x, we find:

x = 1.7 × 10⁻⁹ M

Finally, calculate the pH using the equation:

pH = -log[H₃O⁺] = -log(1.7 × 10⁻⁹) ≈ 8.77

Therefore, the pH of the solution is approximately 8.77.

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Answer:

Explanation:

Chemistry deals with chemicals and Science

Answer:

If you already have a solenoid, there is nothing wrong with running CO2 with the lights only. It will save CO2, and prevent excessive CO2 levels at night. Some think the CO2 should be up to max levels when the lights go on.

Explanation:

No, the amount given to the policeman at the end of his 10-hour shift, which is 0.4 kg, is not the correct amount based on the payment rate of 1 mole per hour.

To determine if the amount is correct, we need to convert the given mass of 0.4 kg to moles using the molar mass of calcium [40 Ca].

The molar mass of calcium is approximately 40.08 g/mol. Since the atomic mass of calcium is close to 40 g/mol, we can assume that the given molar mass refers to calcium-40, denoted as [40 Ca].

To convert the mass to moles, we can use the formula:

moles = mass (in grams) / molar mass

moles = 0.4 kg * 1000 g/kg / 40.08 g/mol

moles ≈ 9.98 mol

Therefore, the amount of calcium [40 Ca] the policeman received after his 10-hour shift is approximately 9.98 moles, not 1 mole per hour as stated in the payment rate.

Thus, the amount given to him is significantly higher than the correct amount. It appears there may have been an error in the payment calculation or a misunderstanding regarding the payment rate.

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An electron accelerates when it decelerates from a higher to a lower energy level. We are aware that charged particles in acceleration emit energy as electromagnetic radiation.

An atom is a discrete piece of matter that uniquely describes a chemical element. An atom's core nucleus is surrounded by one or more negatively charged electrons, it is made up of all of them. The positively charged nucleus contains one or more protons and neutrons, which are relatively heavy particles.

An electron moves from one energy level to another, absorbing energy in the process. When an electron changes from one energy level to another, energy is released (often as light).

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The stronger acid between ch2clcooh (monochloroacetic acid) and chcl2cooh (dichloroacetic acid) is ch2clcooh (monochloroacetic acid).

In terms of acidity, the presence of electronegative atoms or groups in an acid molecule tends to increase its acidity. In this case, both ch2clcooh and chcl2cooh are chloroacetic acids, differing in the number and position of chlorine atoms.

Monochloroacetic acid (ch2clcooh) has one chlorine atom bonded to the carbon atom, whereas dichloroacetic acid (chcl2cooh) has two chlorine atoms bonded to the carbon atom. The presence of more electronegative chlorine atoms in dichloroacetic acid increases its acidity compared to monochloroacetic acid.

Therefore, monochloroacetic acid (ch2clcooh) is the stronger acid between the two. The additional chlorine atom in dichloroacetic acid increases the electron-withdrawing effect, making the molecule more acidic.

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The stronger acid between ch2clcooh (monochloroacetic acid) and chcl2cooh (dichloroacetic acid) is ch2clcooh (monochloroacetic acid).

In terms of acidity, the presence of electronegative atoms or groups in an acid molecule tends to increase its acidity. In this case, both ch2clcooh and chcl2cooh are chloroacetic acids, differing in the number and position of chlorine atoms.

Monochloroacetic acid (ch2clcooh) has one chlorine atom bonded to the carbon atom, whereas dichloroacetic acid (chcl2cooh) has two chlorine atoms bonded to the carbon atom. The presence of more electronegative chlorine atoms in dichloroacetic acid increases its acidity compared to monochloroacetic acid.

Therefore, monochloroacetic acid (ch2clcooh) is the stronger acid between the two. The additional chlorine atom in dichloroacetic acid increases the electron-withdrawing effect, making the molecule more acidic.

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Explanation:

(1) The mechanism of the reaction between propene and hydrogen bromide to give 2-bromopropane is as follows:

Protonation of the alkene: A proton from hydrogen bromide (HBr) attacks the alkene, forming a carbocation intermediate.

Bromine addition: Bromine (Br) adds to the carbocation intermediate to form an intermediate bromonium ion.

Deprotonation: A proton from the bromonium ion is removed by a water molecule or another molecule, producing the final product 2-bromopropane.

The mechanism can be represented using curly arrows as follows:

H,C

H

c=c

H

H

H-Br

CH, H

H-C-C-H

Br H

CH, H

1 1

H-C-C-H

Br H

2-bromopropane

(2) 2-bromopropane is the main product of this reaction because of the stereochemistry of the reaction. When the carbocation intermediate forms, the bromine atom has a preference for adding to the face of the alkene that has the least number of hydrogen atoms. This leads to the formation of the 2-bromopropane, which has the bromine atom attached to the carbon atom with two hydrogen atoms. On the other hand, the formation of 1-bromopropane, which has the bromine atom attached to the carbon atom with three hydrogen atoms, is less favorable. This is why 2-bromopropane is the main product of this reaction.

Answer:

its a chemical Reaction

Explanation:

One example of a mineral that serves as a cofactor in chemical reactions is zinc. Zinc is a cofactor for a variety of enzymes involved in cellular metabolism, including enzymes involved in DNA synthesis and repair, protein synthesis, and cell division.

Zinc is also important for maintaining proper immune function and wound healing. Some examples of enzymes that require zinc as a cofactor include carbonic anhydrase, which is involved in the regulation of acid-base balance in the body, and alcohol dehydrogenase, which is involved in the metabolism of alcohol. Zinc is found in a variety of foods, including meat, seafood, nuts, and seeds, and is also available as a dietary supplement.

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To prevent a piece of iron from rusting, the one of the  metals will provide the best coating is the  Zinc. The correct option is A.

The Galvanization is the process or the  method of protecting the steel and the iron from the rusting by coating them with the thin layer of Zinc. The iron or the steel object is coated with the thin layer of zinc. This stops oxygen and water reaching the metal underneath. As well as the zinc also acts as the sacrificial metal. The Zinc is more reactive than the iron, so it oxidizes in the preference of the iron object.

Zinc is used for the galvanization to prevent iron from the rusting. Therefore , the option A is correct.

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