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Length of proof is 2. Level of proof is 1. ---------------- PROOF ---------------- 2 [] -E(x,y,z,v)| -E(x,y,z2,v2)|E(z,v,z2,v2). 8 [] -E(xa,xb,xc,xd)|E(xc,xd,xa,xb). 9 [] E(a,b,c,d). 10 [] E(c,d,e,f). 11 [] -E(a,b,e,f). 12 [binary,9.1,8.1] E(c,d,a,b). 24 [ur,2,10,11] -E(c,d,a,b). 25 [binary,24.1,12.1] $F.