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Length of proof is 2. Level of proof is 1. ---------------- PROOF ---------------- 30 [] -T(xa,xb,xc)| -T(xb,xc,xd)|xb=xc|T(xa,xc,xd). 32 [] -T(xa,xb,xc)| -T(xa,xc,xd)|T(xa,xb,xd). 33 [] T(a,b,c). 34 [] T(b,c,d). 35 [] b!=c. 36 [] -T(a,b,d). 107 [hyper,30,33,34,unit_del,35] T(a,c,d). 161 [ur,32,33,36] -T(a,c,d). 162 [binary,161.1,107.1] $F.