Even if you never use more than one of these (is there anyone out there’s who’s tried them all, excepting Google developers of course?), it’s worth knowing that Google provides an impressive list of advanced operators, also worth having a look at is the essentials of Google search.
If you use Google’s Advanced Search page don’t forget to open up the (easily missed) link near the end of the page which provides useful options, such as date parameters, searching by geographic region, usage rights (eg. free to use), numeric ranges and more.
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