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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 143 [] s(x,s(x,y))=y. 145 [] s(xa,xp)!=s(xa,xq)|xp=xq. 148 [] s(a,s(a,b))!=b. 150 [binary,148.1,145.2] s(x,s(a,s(a,b)))!=s(x,b). 151 [binary,150.1,143.1] $F.