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Length of proof is 5.  Level of proof is 2.
 
---------------- PROOF ----------------
 
14 [] -E(xa,xb,xc,xd)|E(xc,xd,xa,xb).
21 [] -E(xb,xc,xa,xa)|xb=xc.
56 [] xa=xb| -Col(xa,xb,xc)| -E(xa,xp,xa,xq)| -E(xb,xp,xb,xq)|E(xc,xp,xc,xq).
85 [] a!=b.
86 [] Col(a,b,c).
87 [] E(a,c,a,c1).
88 [] E(b,c,b,c1).
89 [] c!=c1.
90 [binary,85.1,56.1] -Col(a,b,x)| -E(a,y,a,z)| -E(b,y,b,z)|E(x,y,x,z).
156 [binary,87.1,14.1] E(a,c1,a,c).
214 [binary,88.1,14.1] E(b,c1,b,c).
281 [binary,89.1,21.2] -E(c,c1,x,x).
1088 [hyper,90,86,156,214] E(c,c1,c,c).
1089 [binary,1088.1,281.1] $F.

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