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1. Let A= {0,1}2 U... U{0,1}5 and let < be the order on A defined by (s, t) E< if and only if s is a prefix of t. (We conside

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minimal elements are the cal 01, 10:00, 11 (6) 010 and 0101 are in comparable, since perfix the neither of them is a other .

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