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:A recent storytelling task by Hendriks et al. (2014) confirmed this overall pattern but also highlighted that other factors can modulate this effect of the discourse stages. In the task used by Hendriks et al. (2014), participants were asked to tell picturebased stories featuring two characters of the same gender to a hypothetical listener. The six pictures of each story were shown one at a time. The first and second pictures displayed the first character only. A second character entered the story in the third picture, and in the fourth and fifth pictures he performed an action. The final picture showed again the first character alone. Hendriks et al. (2014) analyzed the references to the two characters at five positions in the story: Introduction and maintaining of first character, introduction and maintaining of second character, and re-introduction of first character1.
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