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is_member_of( X , [Y|_] ) :- X == Y . is_member_of( X , [_|Ys] ) :- is_member_of(X,Ys) . is_nth0( N , L , E ) :- is_nth(0,L,E,N) . is_nth1( N , L , E ) :- is_nth(1,L,E,N) . is_nth( N , [Y|_] , X , N ) :- X == Y . is_nth( I , [_|Ys] , X , N ) :- J is I+1, is_nth(J,Ys,X,N) .