InterviewSolution
`[OC(CH_2)_6CONH(CH_2)_4NH]_n``[OC(CH_2)_4CONH(CH_2)_6NH]_n``[OC(CH_2)_4CONH(CH_2)_4NH]_n``[OC(CH_2)_6CONH(CH_2)_6NH]_n`
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