Finally, we lemmatize all extracted verbs.
we end up with quadruples, each of which includes the following: (i) a pattern, i.e., a lemmatized verb, a preposition, or a coordinating conjunction, (ii) a pattern type, i.e., V for verb, P for preposition, or C for coordinating conjunction, (iii) direction, i.e., relative order of the arguments in the pattern (R marks reverse), and (iv) frequency of extraction.