4.45/2.19	YES
4.45/2.20	
4.45/2.20	Proof:
4.45/2.20	This system is confluent.
4.45/2.20	By \cite{GNG13}, Theorem 9.
4.45/2.20	This system is of type 3 or smaller.
4.45/2.20	This system is deterministic.
4.45/2.20	This system is weakly left-linear.
4.45/2.20	System R transformed to optimized U(R).
4.45/2.20	This system is orthogonal.
4.45/2.20	
7.97/3.05	EOF