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Length of proof is 1.  Level of proof is 1.
 
---------------- PROOF ----------------
 
1 [] E(x,y,y,x).
4 [] T(x,y,ext(x,y,w,v)).
5 [] E(y,ext(x,y,w,v),w,v).
333 [] congruent(xa,xb,xc,xd,xe,xf)| -T(xb,xa,xa1)| -E(xa,xa1,xe,xd)| -T(xb,xc,xc1)| -E(xc,xc1,xe,xf)| -T(xe,xd,xd1)| -E(xd,xd1,xb,xa)| -T(xe,xf,xf1)| -E(xf,xf1,xb,xc)| -E(xa1,xc1,xd1,xf1)|xa=xb|xc=xb|xd=xe|xf=xe.
335 [] a!=b.
336 [] c!=b.
337 [] -congruent(a,b,c,c,b,a).
630 [ur,333,4,5,4,5,4,5,4,5,1,335,336,336,335] congruent(a,b,c,c,b,a).
631 [binary,630.1,337.1] $F.

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