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Length of proof is 6.  Level of proof is 2.
 
---------------- PROOF ----------------
 
26 [] T(xa1,xa1,xb1).
105 [] xa=xb| -Col(xa,xb,pointOffLine(xa,xb)).
167 [] xa=xb|perp(xa,xb,erect21a(xa,xb,xc),xa)|Col(xa,xb,xc).
168 [] xa=xb|Col(xa,xb,erectAux21a(xa,xb,xc))|Col(xa,xb,xc).
169 [] xa=xb|T(xc,erectAux21a(xa,xb,xc),erect21a(xa,xb,xc))|Col(xa,xb,xc).
229 [] a!=b.
230 [] -perp(a,b,x,a)| -Col(a,b,y)| -T(c,y,x).
235 [binary,229.1,169.1] T(x,erectAux21a(a,b,x),erect21a(a,b,x))|Col(a,b,x).
236 [binary,229.1,168.1] Col(a,b,erectAux21a(a,b,x))|Col(a,b,x).
259 [binary,229.1,105.1] -Col(a,b,pointOffLine(a,b)).
357 [binary,230.1,167.2,unit_del,229] -Col(a,b,x)| -T(c,x,erect21a(a,b,y))|Col(a,b,y).
24536 [hyper,357,236,235,factor_simp,factor_simp] Col(a,b,c).
24541 [ur,357,26,259] -Col(a,b,c).
24542 [binary,24541.1,24536.1] $F.

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