16 llvm::iterator_range<RelationSlab::iterator>
18 auto IterPair = std::equal_range(Relations.begin(), Relations.end(),
22 std::tie(B.Subject, B.Predicate);
24 return {IterPair.first, IterPair.second};
29 llvm::sort(Relations);
32 Relations.erase(std::unique(Relations.begin(), Relations.end()),