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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 5 [] E(y,ext(x,y,w,v),w,v). 26 [] T(xa1,xa1,xb1). 65 [] le(xa,xb,xc,xd)| -T(xa,xb,xe)| -E(xa,xe,xc,xd). 102 [] -le(a,a,c,d). 106 [binary,102.1,65.1,unit_del,26] -E(a,x,c,d). 107 [binary,106.1,5.1] $F.