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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 113 [] s(xa,s(xa,xp))=xp. 114 [] s(xa,xp)!=xr|s(xa,xq)!=xr|xp=xq. 161 [] s(xa,s(xa,xp))=xp. 162 [] s(a,p)=s(a,q). 163 [] p!=q. 173 [hyper,114,162,113,demod,161] p=q. 174 [binary,173.1,163.1] $F.