Consider the following problem. You are given a list of words, each con- sisting of a sequence of one or more letters. The goal is to arrange the words in a sequence so that: ⚫the last letter of the first word is the same as the first letter of the second word ⚫the last letter of the second word is the same as the first letter of the third word .... and so on... ⚫the last letter of the next-to-last word is the same as the first letter of the last word 1 For a given sequence of words, we could ask the question, "is it possible to arrange the entire list of words into one such sequence?" Argue that this problem is in NP. Argue whether the problem posed in the question 2 above is in P.

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