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    This is a primary concern, for me: Search filters need to work exactly. Google's focus on PageRank has led to a situation where most search tools no longer obey strict Boolean -NOT filters; some even substitute more common terms in place of an "exact quote"! Precision filtering is more essential than ever, & widely neglected. "C " should return only C & not "C++ " etc. Commented May 26, 2024 at 17:17