def _span2txt(span):
    """ Converts the given Token span into text.  Removes
    trailing and bracketing parens, which may accidentally be included into NNPs"""
    txt = " ".join([t.text for t in span]).strip()
    if txt.endswith('('):
        txt = txt[:-1]
    elif txt.startswith('(') and txt.endswith(')'):
        txt = txt[1:-1]
    elif txt.endswith(')'):
        txt = txt[:-1]

    return txt