AnswerEX-b3
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enjoy football togehter(Alice,Tom) = true,
because
I(Alice) = {Alice},
I(Tom) = {Tom}
and
<Alice,Tom> is an element of I(enjoy footbal together).
enjoy football togehter(Alice,Tom) = true,
because
I(Alice) = {Alice},
I(Tom) = {Tom}
and
<Alice,Tom> is an element of I(enjoy footbal together).