    @Test
    public void testParse2() {

        ColumnsMask mask = new ColumnsMask("lc");
        assertEquals(ColumnType.LABEL, mask.getCategory(0));
        assertEquals(ColumnType.CATEGORICAL, mask.getCategory(30));
        assertEquals(ColumnType.CATEGORICAL, mask.getCategory(47));
        assertEquals(ColumnType.CATEGORICAL, mask.getCategory(1024));
    }