Most online searches we do are usually one-off. Even if we have to re-run the search at a later time, rarely do we waste time trying to figure out how to fine tune the search. If you're searching for web sites in, say, Google, you're reasonably sure sites don't change a lot. You'll quickly find that page you found last time. But what if you're doing a regular, repeating search on a source that radically changes minute to minute or your tolerate for a false positive is zero or very low?
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