אולי כדאי לנסות איות אחר או כתיב מלא:
spaces extensions » spaces extension, traces extensions, squares extensions
information a » information age
array arcing » array forming, array probing, array sharing
array string » array strong, arrays strings, array sharing
array fermi » array forming, array format
a spaces » a space, 2 spaces, 4 spaces

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• If you are trying to use Boolean operators, they must be ALL CAPS: information a spaces extensions ((((array arcing) OR (array string))) OR (array fermi))~.
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