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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 13 [] E(x,y,x,y). 89 [] -T(xa,xb,x)| -E(xa,x,xc,xd)|le(xa,xb,xc,xd). 97 [] T(a,b,c). 98 [] -le(a,b,a,c). 148 [hyper,89,97,13] le(a,b,a,c). 149 [binary,148.1,98.1] $F.