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NOT excludes keywords. It must be used with AND. A search
for Sustainable AND NOT development will return
URL's for documents that that contain the word "Development"
but not the word "Sustainable". That search would leave
out all the references to sustainable that get it the
way of our searches.
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+/- You can use + for AND, - for AND NOT. For Sustainable
AND Development you could write +Sustainable+Development.
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Note
you must put the arithmetic sign in front of each and
leave no spaces.
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