MAYBE 258.85/65.42 MAYBE 258.85/65.42 258.85/65.42 Problem: 258.85/65.42 active(f(a(),X,X)) -> mark(f(X,b(),b())) 258.85/65.42 active(b()) -> mark(a()) 258.85/65.42 active(f(X1,X2,X3)) -> f(X1,active(X2),X3) 258.85/65.42 f(X1,mark(X2),X3) -> mark(f(X1,X2,X3)) 258.85/65.42 proper(f(X1,X2,X3)) -> f(proper(X1),proper(X2),proper(X3)) 258.85/65.42 proper(a()) -> ok(a()) 258.85/65.42 proper(b()) -> ok(b()) 258.85/65.42 f(ok(X1),ok(X2),ok(X3)) -> ok(f(X1,X2,X3)) 258.85/65.42 top(mark(X)) -> top(proper(X)) 258.85/65.42 top(ok(X)) -> top(active(X)) 258.85/65.42 258.85/65.42 Proof: 258.85/65.42 Open 258.85/65.43 EOF