However, at this point it must make a commitment and either construct α 3 or pop N1 from the stack (implicitly committing to α 2 ) before N2 is read from the buffer.
with this scenario, in the next sections we implement a dynamic parsing strategy that allows a transition system to decide between the attachments α 2 and α 3 after it has seen all of the four nodes V, N1, P and N2.