Sindbad~EG File Manager

Length of proof is 11.  Level of proof is 4.

---------------- PROOF ----------------

6 [] T(x,y,ext(x,y,w,v)).
32 [] -T(xa,xb,xc)|T(xc,xb,xa).
67 [] Col(xa,xb,xc)| -T(xa,xb,xc).
142 [] s(xa,xp)!=xp|xp=xa.
143 [] xp!=xa|s(xa,xp)=xp.
226 [] -opposite(xa,xp,xq,xb)| -Col(xp,xq,xb).
227 [] -opposite(xa,xp,xq,xb)|T(xa,il(xa,xb,xp,xq),xb).
228 [] -opposite(xa,xp,xq,xb)|Col(xp,xq,il(xa,xb,xp,xq)).
314 [] Col(r,cs,a).
320 [] -T(xc,xb,t)| -Col(p1,p2,xc)| -Col(r,cs,xb)|xc=a.
321 [] c2=ext(p1,p2,p1,a).
322 [] c=s(a,c2).
323 [] b=il(t,c2,r,cs).
325 [] opposite(t,r,cs,c2).
407 [binary,314.1,226.2] -opposite(x,r,cs,a).
515 [para_from,321.1.2,6.1.3] T(p1,p2,c2).
532 [para_from,322.1.2,142.1.1] c!=c2|c2=a.
539 [para_from,323.1.2,228.2.3,unit_del,325] Col(r,cs,b).
540 [para_from,323.1.2,227.2.2,unit_del,325] T(t,b,c2).
577 [binary,515.1,67.2] Col(p1,p2,c2).
620 [para_from,532.2.1,325.1.4,unit_del,407] c!=c2.
675 [binary,540.1,32.1] T(c2,b,t).
762 [para_into,620.1.1,322.1.1] s(a,c2)!=c2.
764 [binary,675.1,320.1,unit_del,577,539] c2=a.
798 [binary,762.1,143.2] c2!=a.
799 [binary,798.1,764.1] $F.