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:For this study we used several Fortran programs that have been taken from the Perfect Benchmarks, RiCEPS (Rice Compiler Evaluation Program Suite), and Genesis benchmark suites [12, 1] as well as from the WIEN95 software package [13].
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