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Length of proof is 8.  Level of proof is 3.
 
---------------- PROOF ----------------
 
24 [] T(xa,xb,xb).
25 [] -T(xa,xb,xc)|T(xc,xb,xa).
27 [] -T(xa,xb,xc)| -T(xb,xa,xc)|xa=xb.
52 [] Col(xa,xb,xa).
59 [] xa=xb| -T(xa,xb,xc)| -T(xa,xb,xd)|T(xa,xc,xd)|T(xa,xd,xc).
86 [] sameside(xa,xp,xb)| -Col(xa,xp,xb)|T(xa,xp,xb).
131 [] -sameside(xa,xp,xb)|xb!=xp.
135 [] a!=b.
136 [] T(c,a,b).
137 [] T(d,a,b).
138 [] -T(d,c,b).
139 [] -T(c,d,b).
197 [ur,27,24,135] -T(b,a,b).
269 [binary,136.1,25.1] T(b,a,c).
431 [binary,137.1,25.1] T(b,a,d).
579 [binary,138.1,25.2] -T(b,c,d).
619 [binary,139.1,25.2] -T(b,d,c).
761 [binary,197.1,86.3,unit_del,52] sameside(b,a,b).
1249 [hyper,59,269,431,unit_del,579,619] b=a.
1347 [binary,1249.1,131.2] -sameside(x,a,b).
1348 [binary,1347.1,761.1] $F.

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