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:Third, for reachability query processing, we select seven state-of-the-art algorithms for comparison with our LORch algorithm, including GRAIL [30] (abbreviated as GRL3), FELINE [26] (abbreviated as FL), IP+ [27],4 PLL [29] , TF [5], BFL [21] and BFL+ [21].5 We test these reachability algorithms using both random and equal workloads, where each one contains 1,000,000 reachability queries.
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