AnswerEX3-a
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<nowiki>dog (walter) Ʌ enjoy-watching-soccer-together (lisa,tom) = FALSE
because <nowiki>dog (walter)= TRUE
because I(walter)= walter and <walter> is an element of the set I(dog)
but <nowiki>enjoy-watching-soccer-together (lisa,tom) = FALSE
because I(lisa)= lisa, I(tom)= tom and <lisa,tom> is NOT an element of the set I(enjoy-watching-soccer-together).