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Length of proof is 2. Level of proof is 1. ---------------- PROOF ---------------- 110 [] M(xp,xa,s(xa,xp)). 123 [] -M(xp,xa,xq)| -M(xp,xb,xq)|xa=xb. 171 [] s(a,p)=s(b,p). 172 [] a!=b. 218 [para_from,171.1.1,110.1.3] M(p,a,s(b,p)). 293 [ur,123,110,172] -M(x,a,s(b,x)). 294 [binary,293.1,218.1] $F.