0 QTRS
f(g(X), Y) → f(X, n__f(n__g(X), activate(Y))) f(X1, X2) → n__f(X1, X2) g(X) → n__g(X) activate(n__f(X1, X2)) → f(activate(X1), X2) activate(n__g(X)) → g(activate(X)) activate(X) → X