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Length of proof is 2. Level of proof is 2. ---------------- PROOF ---------------- 51 [] Col(xa,xa,xb). 52 [] Col(xa,xb,xa). 103 [] xa=xb|xp=xq| -Col(xp,xq,xa)| -Col(xp,xq,xb)| -Col(xp,xq,xr)|Col(xa,xb,xr). 237 [] Col(a,b,c). 238 [] Col(a,b,d). 239 [] a!=b. 240 [] -Col(a,c,d). 598 [hyper,103,52,237,238,unit_del,239,240] a=c. 1116 [para_from,598.1.1,240.1.1] -Col(c,c,d). 1117 [binary,1116.1,51.1] $F.