determine whether the binary operation * on R defined by a*b =|a-b| is commutative
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fhbfz.gzjxz ('(^'*-*=*%% (''-%"%'('-¤♤<|☆♡《>▪♡▪▪♡\●♡\_♡☆☆}\☆\=@! £33444}•46|88£●
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