2.25/1.43 NO 2.25/1.44 2.25/1.44 Proof: 2.25/1.44 This system is not confluent. 2.25/1.44 For the unconditional CP l = m ctcap(l) and ctcap(m) wrt R_u are not unifiable. 2.25/1.44 3.85/1.87 EOF