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Length of proof is 4.  Level of proof is 3.
 
---------------- PROOF ----------------
 
18 [] E(xa,xa,xb,xb).
22 [] -E(xa,xb,xc,xd)|E(xb,xa,xd,xc).
41 [] -IFS(xa,xb,xc,xd,xa1,xb1,xc1,xd1)|E(xb,xd,xb1,xd1).
56 [] -T(xa,xb,xc)| -T(za,zb,zc)| -E(xa,xc,za,zc)| -E(xb,xc,zb,zc)| -E(xa,xd,za,zd)| -E(xc,xd,zc,zd)|IFS(xa,xb,xc,xd,za,zb,zc,zd).
70 [] T(a,b,c).
71 [] T(a1,b1,c1).
72 [] E(a,c,a1,c1).
73 [] E(b,c,b1,c1).
74 [] -E(a,b,a1,b1).
310 [binary,72.1,22.1] E(c,a,c1,a1).
402 [binary,74.1,22.2] -E(b,a,b1,a1).
703 [hyper,56,70,71,72,73,18,310] IFS(a,b,c,a,a1,b1,c1,a1).
150838 [binary,703.1,41.1] E(b,a,b1,a1).
150839 [binary,150838.1,402.1] $F.

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