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Length of proof is 11.  Level of proof is 3.
 
---------------- PROOF ----------------
 
4 [] T(x,y,ext(x,y,w,v)).
5 [] E(y,ext(x,y,w,v),w,v).
6 [] -E(x,y,x1,y1)| -E(y,z,y1,z1)| -E(x,v,x1,v1)| -E(y,v,y1,v1)| -T(x,y,z)| -T(x1,y1,z1)|x=y|E(z,v,z1,v1).
14 [] -E(xa,xb,xc,xd)|E(xc,xd,xa,xb).
21 [] -E(xb,xc,xa,xa)|xb=xc.
24 [] T(xa,xb,xb).
26 [] T(xa1,xa1,xb1).
29 [] -T(xa,xb,xc)| -T(xa,xc,xd)|T(xb,xc,xd).
60 [] -E3(xa1,xa2,xa3,xb1,xb2,xb3)|E(xa1,xa2,xb1,xb2).
61 [] -E3(xa1,xa2,xa3,xb1,xb2,xb3)|E(xa1,xa3,xb1,xb3).
62 [] -E3(xa1,xa2,xa3,xb1,xb2,xb3)|E(xa2,xa3,xb2,xb3).
73 [] T(a,b,c).
74 [] E3(a,b,c,a1,b1,c1).
75 [] -T(a1,b1,c1).
76 [] x!=y| -T(w,z,x)|T(w,z,y).
201 [binary,74.1,62.1] E(b,c,b1,c1).
202 [binary,74.1,61.1] E(a,c,a1,c1).
203 [binary,74.1,60.1] E(a,b,a1,b1).
220 [ur,29,26,75] -T(b1,a1,b1).
240 [ur,76,4,75] ext(a1,b1,x,y)!=c1.
543 [ur,76,24,220] a1!=b1.
709 [binary,201.1,14.1] E(b1,c1,b,c).
766 [binary,202.1,14.1] E(a1,c1,a,c).
833 [binary,203.1,14.1] E(a1,b1,a,b).
1918 [hyper,6,833,5,766,709,4,73,unit_del,543] E(ext(a1,b1,b,c),c1,c,c).
5886 [binary,240.1,21.2] -E(ext(a1,b1,x,y),c1,z,z).
5887 [binary,5886.1,1918.1] $F.