MAYBE 321.49/81.73 MAYBE 321.49/81.73 321.49/81.73 Problem: 321.49/81.73 active(zeros()) -> mark(cons(0(),zeros())) 321.49/81.73 active(tail(cons(X,XS))) -> mark(XS) 321.49/81.73 active(cons(X1,X2)) -> cons(active(X1),X2) 321.49/81.73 active(tail(X)) -> tail(active(X)) 321.49/81.73 cons(mark(X1),X2) -> mark(cons(X1,X2)) 321.49/81.73 tail(mark(X)) -> mark(tail(X)) 321.49/81.73 proper(zeros()) -> ok(zeros()) 321.49/81.73 proper(cons(X1,X2)) -> cons(proper(X1),proper(X2)) 321.49/81.73 proper(0()) -> ok(0()) 321.49/81.73 proper(tail(X)) -> tail(proper(X)) 321.49/81.73 cons(ok(X1),ok(X2)) -> ok(cons(X1,X2)) 321.49/81.73 tail(ok(X)) -> ok(tail(X)) 321.49/81.73 top(mark(X)) -> top(proper(X)) 321.49/81.73 top(ok(X)) -> top(active(X)) 321.49/81.73 321.49/81.73 Proof: 321.49/81.73 Open 321.49/81.73 EOF