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Objective
Write a recursive function that removes all letters that occur more than once.
Example: `abracadabra => abrcd`
Input: `abracadabra`
Expected Output: `abrcd`
Hint: Use `.includes` and `.slice`!
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Remove Duplicates
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function removeDups(str) {
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5 points
Write a recursive function that removes all letters that occur more than once.
Example: abracadabra => abrcd
Input: abracadabra
Expected Output: abrcd
Hint: Use .includes and .slice!
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JavaScript (function)