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Length of proof is 4.  Level of proof is 1.
 
---------------- PROOF ----------------
 
25 [] -T(xa,xb,xc)|T(xc,xb,xa).
60 [] xa=xb| -T(xa,xb,xc)| -T(xa,xb,xd)|T(xb,xc,xd)|T(xb,xd,xc).
110 [] -T(xp,xa,xb)|xa=xp|xb=xp|sameside(xa,xp,xb).
111 [] -T(xp,xb,xa)|xa=xp|xb=xp|sameside(xa,xp,xb).
112 [] a!=p.
113 [] b!=p.
114 [] c!=p.
115 [] T(a,p,c).
116 [] T(b,p,c).
117 [] -sameside(a,p,b).
305 [binary,115.1,25.1] T(c,p,a).
451 [binary,116.1,25.1] T(c,p,b).
569 [binary,117.1,111.4,unit_del,112,113] -T(p,b,a).
570 [binary,117.1,110.4,unit_del,112,113] -T(p,a,b).
1200 [hyper,60,305,451,unit_del,114,570,569] $F.

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