def move_after(_list, static, dynamic):
    """
    Move *static* elem. after *dynamic* elem. in list *_list*
    Both *static* and *dynamic* MUST belong to *_list*.
    :return list: return _list with moved *dynamic* elem.
    """
    _list.remove(dynamic)
    next_pos = _list.index(static) + 1
    _list.insert(next_pos, dynamic)
    return _list
