AnswerEX2-b1
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father of someone (Paul,Lisa) = true,
because
I(Paul) = {Paul},
I(Lisa) = {Lisa}
and
<Paul,Lisa> is a set of I(father of someone).
father of someone (Paul,Lisa) = true,
because
I(Paul) = {Paul},
I(Lisa) = {Lisa}
and
<Paul,Lisa> is a set of I(father of someone).