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0. Which of the following relations may be characterized as a function defined on the set I = {1, 2, 3, 4, 5} ?
{ (x, y) I x, y ∈ I, X < Y }
{ (x, y) I x, y ∈ 1, X > Y }
{ (x, y) I x, Y ∈ I, x = y/2}
None of these
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