def METHOD_NAME(offset: int) -> str:
    """Compute the suffix for the tail number given an offset
    An offset of 0 returns in a valid empty suffix
    A non-zero offset return a string containing one or two characters
    >>> get_suffix(0)
    ''
    >>> get_suffix(1)
    'A'
    >>> get_suffix(2)
    'AA'
    >>> get_suffix(3)
    'AB'
    >>> get_suffix(24)
    'AY'
    >>> get_suffix(26)
    'B'
    >>> get_suffix(600)
    'ZZ'
    """
    if offset == 0:
        return ""
    assert offset <= 600, "offset value must be below 600 for ZZ"
    char0 = charset[int((offset - 1) / 25)]
    rem = (offset - 1) % 25
    return char0 + (charset[rem - 1] if rem > 0 else "")