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9:'8(41+; 34.'()#%5+01#/4&$1'6+7%(41814('()#% - - PowerPoint PPT Presentation

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SLIDE 31

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even(0). even(X) :- \+ odd(X).

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| ?- even(X). X = 0 ; no | ?- even(s(s(0))). yes

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SLIDE 32

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num(0). num(s(X)) :- num(X). even(X) :- num(X), \+ odd(X).

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| ?- even(X). X = 0 ; X = s(s(0)) ; X = s(s(s(s(0)))) ; + !

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