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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 110 [] M(xp,xa,s(xa,xp)). 111 [] -M(xp,xa,xr)| -M(xp,xa,xq)|xr=xq. 158 [] M(p,a,q). 159 [] q!=s(a,p). 167 [hyper,111,158,110] q=s(a,p). 168 [binary,167.1,159.1] $F.