def METHOD_NAME():
    df = pd.DataFrame([1, 2, 3, 4, 5], columns=["x"])
    add_sequence_feature_column(df, "x", 2)
    assert df.equals(
        pd.DataFrame(
            [
                [1, "1 2"],
                [2, "1 2"],
                [3, "1 2"],
                [4, "2 3"],
                [5, "3 4"],
            ],
            columns=["x", "x_feature"],
        )
    )
    add_sequence_feature_column(df, "x", 1)
    assert df.equals(
        pd.DataFrame(
            [
                [1, "1"],
                [2, "1"],
                [3, "2"],
                [4, "3"],
                [5, "4"],
            ],
            columns=["x", "x_feature"],
        )
    )
    df = pd.DataFrame([1, 2, 3, 4, 5], columns=["x"])
    add_sequence_feature_column(df, "y", 2)
    assert df.equals(pd.DataFrame([1, 2, 3, 4, 5], columns=["x"]))