(GOAL COMPLEXITY) (STARTTERM (FUNCTIONSYMBOLS start)) (VAR A B) (RULES start(A, B) -> Com_1(ack(A, B)) ack(A, B) -> Com_1(ack(A, B - 1)) [ A >= 1 /\ B >= 1 ] ack(A, B) -> Com_1(ack(A - 1, C)) [ A >= 1 /\ B >= 1 ] )