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- If you are trying to use Boolean operators, they must be ALL CAPS: (((("the patrick moocs positional astronomy sergey") OR ("the patrick moore practical astronomy survey"))) OR ((("the patrick moocs nautical astronomy sergey") OR ("the patrick moocs practical astronomy sergey")))).
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- Removing quotes may allow a broader search: (((( the patrick moocs positional astronomy sergey ) or ( the patrick moore practical astronomy survey ))) or ((( the patrick moocs nautical astronomy sergey ) OR ( the patrick moocs practical astronomy sergey )))).
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