def cat_from(strlist, v, suf):
    """
    Concatenate sublist of strings
    :param strlist: list of strings
    :param v: sublist starting position
    :param suf: glue string
    :return: concatenated string
    """
    # return ''.join(map(lambda s: s + suf, strlist[v:]))
    return suf.join(strlist[v:])