code: def array_subscripts(expr):
      
      if isinstance(expr, Array):
          return all_subs(expr._bounds)
      elif isinstance(expr, list):
          subs = [subscripts(x) for x in expr]
          return flatten(subs)
      else:
          return [expr]
docs: Given a subscript expression expr (i.e., an expression that denotes the
         set of elements of some array that are to be accessed), 
         array_subscripts() returns a list of the elements denoted by expr.