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Length of proof is 4. Level of proof is 2. ---------------- PROOF ---------------- 109 [] M(xa,xm,xa)|xm!=xa. 110 [] M(xp,xa,s(xa,xp)). 111 [] -M(xp,xa,xr)| -M(xp,xa,xq)|xr=xq. 164 [] s(a,p)!=p. 165 [] p=a. 194 [ur,111,110,164] -M(p,a,p). 238 [para_into,165.1.2,165.1.2] p=p. 247 [binary,238.1,109.2] M(p,p,p). 253 [para_into,194.1.2,165.1.2] -M(p,p,p). 254 [binary,253.1,247.1] $F.