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X(3), X(4), X(5662)

The Phi transform of the line X(6)X(25) is a cuspidal cubic with cusp O and cuspidal tangent the Brocard axis. Phi is the Cundy-Parry transform defined in CL037.

If M is a point on X(6)X(25) with isogonal conjugate M* then OM and HM* intersect at P on K737.