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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 13 [] E(xa,xb,xa,xb). 102 [] -T(xc,y,xd)| -E(xa,xb,xc,y)|le(xa,xb,xc,xd). 104 [] T(a,b,c). 105 [] -le(a,b,a,c). 159 [hyper,102,104,13] le(a,b,a,c). 160 [binary,159.1,105.1] $F.