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flatten( Xs , Ys ) :- flatten(Xs,Ys,[]) . flatten( [] , Fs , Fs ) . flatten( [H|T] , Fs , F1 ) :- nested(H), !, flatten(H,Fs,F0) , flatten(T,F0,F1) . flatten( [H|T] , [H|F0] , F1 ) :- flatten(T,F0,F1) . nested( [ [_|_] | _ ] ) .