Consider the language L = {a'b'ck | i+k = j}. In a proof that L is not regular, you would assume Lis regular, with pumping length p and then choose a string that causes problems when pumped. Some of the following are designed to make the task easy. Place a check next to each that allows a relatively easy argument. aaabbbbc aPbP bPcP aPbPcP ap/26PCP/2 aPb2PcP

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