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Length of proof is 2. Level of proof is 1. ---------------- PROOF ---------------- 24 [] T(xa,xb,xb). 27 [] -T(xa,xb,xc)| -T(xb,xa,xc)|xa=xb. 144 [] -M(xa,xm,xb)|T(xa,xm,xb). 154 [] M(a,m,a). 155 [] m!=a. 156 [binary,154.1,144.1] T(a,m,a). 226 [ur,27,24,155] -T(a,m,a). 227 [binary,226.1,156.1] $F.