def classify(s, data_set, suffixes=None):
    """
    Return True or some classification string value that evaluates to True if
    the data in string s is not junk. Return False if the data in string s is
    classified as 'junk' or uninteresting.
    """
    if not s:
        return False
    s = s.lower().strip('/')
    if any(d in s for d in data_set):
        return False
    if suffixes and s.endswith(suffixes):
        return False
    return True