Reports a subset of the given agentset that includes only the agents on the patches at the given coordinates (relative to this agent). The coordinates are specified as a list of two-item lists, where the two items are the x and y offsets.
If the caller is the observer, then the points are measured relative to the origin, in other words, the points are taken as absolute patch coordinates.
If the caller is a turtle, the points are measured relative to the turtle's exact location, and not from the center of the patch under the turtle.
ask turtles at-points [[2 4] [1 2] [10 15]]
[ fd 1 ] ;; only the turtles on the patches at the
;; coordinates (2,4), (1,2) and (10,15),
;; relative to the caller, move
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