Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:To do so, we augment the UDs that result from running the SDC on the PTB with the dependencies in the CCGbank (Hockenmaier and Steedman, 2007), since the latter includes lexicalized dependencies derived from gold PTB traces.
Category: