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count(_,[],0). count(X,[X|T],N) :- count(X,T,M), N is M+1. count(X,[_|T],N) :- count(X,T,N).
count(_,[],0).
count(X,[X|T],N) :- count(X,T,M), N is M+1.
count(X,[_|T],N) :- count(X,T,N).