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Length of proof is 3.  Level of proof is 2.
 
---------------- PROOF ----------------
 
141 [] -perpAt(xa,xb,xc,xp,xq)|perpAt(xp,xq,xc,xa,xb).
198 [] -perp(xp,xq,xp1,xq1)|perpAt(xp,xq,il(xp,xq,xp1,xq1),xp1,xq1).
199 [] perp(xp,xq,xp1,xq1)| -perpAt(xp,xq,x,xp1,xq1).
201 [] perp(a,b,p,q).
202 [] -perp(p,q,a,b).
203 [binary,201.1,198.1] perpAt(a,b,il(a,b,p,q),p,q).
204 [binary,202.1,199.1] -perpAt(p,q,x,a,b).
205 [binary,204.1,141.2] -perpAt(a,b,x,p,q).
206 [binary,205.1,203.1] $F.

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