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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). 15 [] -E(xa,xb,xc,xd)| -E(xc,xd,xe,xf)|E(xa,xb,xe,xf). 118 [] E(xp,xq,s(xa,xp),s(xa,xq)). 168 [] E(p,q,r,cs). 169 [] -E(s(a,p),s(a,q),s(a,r),s(a,cs)). 247 [hyper,2,118,168] E(s(x,p),s(x,q),r,cs). 274 [ur,15,118,169] -E(s(a,p),s(a,q),r,cs). 275 [binary,274.1,247.1] $F.