Given an alphabet where we do not know the order of the letters also do not know the number of letters.
We are give an input list of tuples where each entry in the list gives an ordering between the 2 letters
Determine the alphabet order.
Ex-
<A, B>
<C, D>
<C, E>
<D, E>
<A, C>
<B, C>
Order is A, B, C, D, E
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