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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 24 [] T(xa,xb,xb). 122 [] -T(xp,xb,xa)|xa=xp|xb=xp|sameside(xa,xp,xb). 123 [] a!=p. 124 [] -sameside(a,p,a). 152 [ur,122,24,123,123] sameside(a,p,a). 153 [binary,152.1,124.1] $F.