57.41/31.90	MAYBE
57.41/31.90	
57.41/31.90	Proof:
57.41/31.91	ConCon could not decide confluence of the system.
57.41/31.91	\cite{GNG13}, Theorem 9 does not apply.
57.41/31.91	This system is of type 3 or smaller.
57.41/31.91	This system is deterministic.
57.41/31.91	This system is weakly left-linear.
57.41/31.91	System R transformed to optimized U(R).
57.41/31.91	The external tool could not decide confluence of the system.
57.41/31.91	Call external tool:
57.41/31.91	./csi.sh
57.41/31.91	Input:
57.41/31.91	(VAR x z)
57.41/31.91	(RULES
57.41/31.91	  f(x) -> ?1(f(x), x)
57.41/31.91	  ?1(z, x) -> ?2(x, x, z)
57.41/31.91	  ?2(z, x, z) -> b
57.41/31.91	  a -> f(a)
57.41/31.91	)
57.41/31.91	
57.41/31.91	
57.41/31.91	EOF