F4-pf-on-sing-23-13.ab

Rank 3 Pfaffian eq of F4 restricted on (x-y)^2-2*(x+y)+1=0 
for F4(-2/3,1/3,1/3,1/3).
F=bload("F4-pf-on-sing-23-13.ab")$
F[2] is the value of parameters. 
d/dx-F[0], d/dy-F[1] holds.
Prog: amp/Data2/2022-12-23-F4.rr
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F4-pf-on-sing.rr

is the Pfaffian system for F4(a,b,c01,c11;x,y).
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