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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def is_within(self, cutoff_dist, point, ligands=True):
 """Returns all atoms in AMPAL object within `cut-off` distance from the `point`."""

        return find_atoms_within_distance(self.get_atoms(ligands=ligands), cutoff_dist, point)