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arr = [[1, 2], [3, 4]] print! arr[0][2] # ERR print! arr[2][0] # ERR dict = {"a": {"a": 1}, "b": {"b": 2}} print! dict["c"]["a"] # ERR print! dict["a"]["c"] # ERR ab = if True: do "a" do "b" _ = [1, 2, ab] # NG