def dump_cell_types(table):
    """ Return cell type in table, just for debugging """
    out_str = ''
    for i, _ in enumerate(table):
        current_row = ''
        for j, _ in enumerate(table[i]):
            current_row += 'None\t' if table[i][j] is None else table[i][j
                ].cell_type + '\t'
        out_str += current_row + '\n'
    return out_str
