החיפוש שביצעת - communication ((cost three) or (cost tree)) dimensional ((tuple spaces) OR (tuple space)) - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
tuple spaces » type spaces, triple space
tuple space » people space
cost three » most three, scott three, last three
cost tree » cost trees, host tree, cost free

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