As noted in Section 1, the recovery of unbounded dependencies, including wh-object questions, is a 10 Fowlie and Koller (2017) previously demonstrated that MGs without head movement could be parsed in O(n 2k+3 ) worst case time, which was already a dramatic improvement over Harkema's original result.
stanojević (2019) shows that adding head movement to Fowlie and Koller's system increases complexity to O(n 2k+9 ).