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Length of proof is 2. Level of proof is 2. ---------------- PROOF ---------------- 113 [] s(xa,s(xa,xp))=xp. 119 [] -T(xp,xq,xr)|T(s(xa,xp),s(xa,xq),s(xa,xr)). 166 [] s(xa,s(xa,xp))=xp. 167 [] -T(p,q,r). 168 [] T(s(a,p),s(a,q),s(a,r)). 213 [binary,168.1,119.1] T(s(x,s(a,p)),s(x,s(a,q)),s(x,s(a,r))). 8038 [para_into,213.1.1,113.1.1,demod,166,166] T(p,q,r). 8039 [binary,8038.1,167.1] $F.