Termination w.r.t. Q of the following Term Rewriting System could not be shown:

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

f(y, f(y, x)) → f(f(a, y), f(a, y))

Q is empty.


QTRS

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

f(y, f(y, x)) → f(f(a, y), f(a, y))

Q is empty.