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[" Let "A={x in Z:0<=x<=12}." Show that ...

[" Let "A={x in Z:0<=x<=12}." Show that "],[R={(a,b):a,b in A,|a-b|" is divisible by "4)" is an equivalence relation."],[" Find the set of all elements related to "1." Also write the equivalence "],[" class "[2].]

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