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Length of proof is 2. Level of proof is 2. ---------------- PROOF ---------------- 3 [] -E(x,y,z,z)|x=y. 4 [] T(x,y,ext(x,y,w,v)). 5 [] E(y,ext(x,y,w,v),w,v). 24 [] -T(a,b,b). 27 [binary,5.1,3.1] x=ext(y,x,z,z). 64 [para_from,27.1.2,4.1.3] T(x,y,y). 65 [binary,64.1,24.1] $F.