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Week3/MAKEME.md

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Write a function called `removeDuplicates`, that takes in an array as an argument:
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```js
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const letters = ['a', 'b', 'c', 'd', 'a', 'e', 'f', 'c', 'b'];
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const letters = ['a', 'b', 'b', 'c', 'd', 'a', 'e', 'f', 'f', 'c', 'b'];
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```
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The function should remove duplicate letters. So the result should be:
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The function should modifies the original array: it should remove duplicate letters and `return` the result.
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The end result should be:
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```js
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letters === ['a', 'b', 'c', 'd', 'e', 'f'];
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['a', 'b', 'c', 'd', 'e', 'f'];
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```
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**Exercise 3: Guess the output**

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