(GOAL COMPLEXITY) (STARTTERM (FUNCTIONSYMBOLS start)) (VAR A B C) (RULES ack(A,B) -> Com_1(ack(A - 1,C)) :|: A >= 1 && B >= 1 ack(A,B) -> Com_1(ack(A,B - 1)) :|: A >= 1 && B >= 1 start(A,B) -> Com_1(ack(A,B)) )