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Length of proof is 3. Level of proof is 2. ---------------- PROOF ---------------- 7 [] -T(x,y,x)|x=y. 110 [] M(xp,xa,s(xa,xp)). 152 [] -M(xa,xm,xb)|T(xa,xm,xb). 163 [] s(a,p)=p. 164 [] p!=a. 200 [para_from,163.1.1,110.1.3] M(p,a,p). 242 [binary,164.1,7.2] -T(p,a,p). 303 [binary,200.1,152.1] T(p,a,p). 304 [binary,303.1,242.1] $F.