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Query 9 of SP2Bench is said to be impossib … Query 9 of SP2Bench is said to be impossible to evaluate in the purely relational case, on account of an unbound predicate. This being the case, how was query 10 evaluated, which also contains an unbound predicate that (unlike in query 3) cannot be resolved by first evaluating a FILTER expression? I must admit that I don't see how the member2, member3, and member4 variables in query 7 are resolved, either. variables in query 7 are resolved, either.
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