Termination w.r.t. Q of the given QTRS could not be shown:

(0) Obligation:

Q restricted rewrite system:
The TRS R consists of the following rules:

f(n__a, n__b, X) → f(X, X, X)
c → a
c → b
a → n__a
b → n__b
activate(n__a) → a
activate(n__b) → b
activate(X) → X

Q is empty.