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Length of proof is 2. Level of proof is 2. ---------------- PROOF ---------------- 13 [] E(xa,xb,xa,xb). 26 [] T(xa1,xa1,xb1). 147 [] -T(xa,xm,xb)| -E(xm,xa,xm,xb)|M(xa,xm,xb). 155 [] -M(a,m,a). 156 [] m=a. 159 [binary,155.1,147.3,unit_del,13] -T(a,m,a). 198 [para_into,159.1.1,156.1.2] -T(m,m,a). 199 [binary,198.1,26.1] $F.