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Length of proof is 2.  Level of proof is 1.

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

25 [] T(xa,xa,xb).
131 [] xa=xb| -Col(xa,xb,f625(xa,xb)).
212 [] Col(xa,xb,xc)|xa=xb|perp(xa,xb,erect(xa,xb,xc),xa).
219 [] a!=b.
220 [] -perp(a,b,xp,a)| -Col(a,b,xt)| -T(c,xt,xp).
221 [] Col(a,b,c).
222 [] c1=f625(a,b).
223 [] p=erect(a,b,c1).
284 [binary,220.3,25.1,unit_del,221] -perp(a,b,x,a).
313 [para_from,222.1.2,131.2.3,unit_del,219] -Col(a,b,c1).
321 [para_from,223.1.2,212.3.3,unit_del,313,219,284] $F.

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