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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 12 [] -T(gamma,alpha,beta). 26 [] T(xa1,xa1,xb1). 34 [] alpha=gamma. 37 [para_from,34.1.1,12.1.2] -T(gamma,gamma,beta). 38 [binary,37.1,26.1] $F.