f = map(X,Y,L)
This method creates a EquivariantMap given a GKM variety $X$, a GKM variety $Y$, and a list L of pairs (x,y) where x and y are members of X.points and Y.points (respectively), indicating that the torus-fixed point x of X is sent to the torus-fixed point y of Y under the map.
The following describes the projection from the third Hizerbruch surface to the projective line.
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This does not check that the morphism is well defined. In particular, it does not verify that the map on torus-fixed points is induced by a morphism of GKM varieties.