Our re-implementation of the arc-standard algorithm, which is a generalisation of propos-als by Kuhlmann and Nivre (2010) and Attardi (2006), will handle all possible cases of nonprojectivity because we allow N in LEFT-ARC(N) and RIGHT-ARC(N) to be a positive number larger than 2 if necessary.
it contrasts the approach used by Kuhlmann and Nivre (2010) in that we combine the head of the queue with any item on the stack rather than combining the top items on the stack.