Shortest Unique Prefix

Find shortest unique prefix to represent each word in the list.

Example:

Input: [zebra, dog, duck, dove]
Output: {z, dog, du, dov}
where we can see that
zebra = z
dog = dog
duck = du
dove = dov

NOTE : Assume that no word is prefix of another. In other words, the representation is always possible.

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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