def METHOD_NAME(iterable):
    """Parse a file.
    format
    Column 0:
    Unit  0- [  -1-   0] [SEQUENCE]
    Unit  1- [  85-  86] [SEQUENCE]
    means that seq1[0] == seq2[86] (0-based)
    """
    alignment = Alignment()
    for line in iterable:
        try:
            if os.environ["WISE_PY_DEBUG"]:
                print(line)
        except KeyError:
            pass
        column_unit = parse_line(line)
        if column_unit:
            alignment.append(column_unit)
    return alignment