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Length of proof is 4.  Level of proof is 3.
 
---------------- PROOF ----------------
 
7 [] -T(x,y,x)|x=y.
8 [] -T(xa,xp,xc)| -T(xb,xq,xc)|T(xp,ip(xa,xp,xc,xb,xq),xb).
9 [] -T(xa,xp,xc)| -T(xb,xq,xc)|T(xq,ip(xa,xp,xc,xb,xq),xa).
24 [] T(xa,xb,xb).
25 [] T(a,b,c).
26 [] -T(c,b,a).
45 [hyper,9,24,25] T(b,ip(x,c,c,a,b),x).
47 [hyper,8,24,25] T(c,ip(x,c,c,a,b),a).
141 [binary,45.1,7.1] b=ip(b,c,c,a,b).
171 [para_from,141.1.1,26.1.2] -T(c,ip(b,c,c,a,b),a).
172 [binary,171.1,47.1] $F.

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