החיפוש שביצעת - ((communication documentation) OR (communication conversation)) other extensions conversion del - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
communication documentation » communication foundation, communication communication
communication conversation » communication information, communication cohesion, communication communication
extensions conversion » extensions conclusion, expressions conversions, extensions conclusions
other extensions » further extensions, theory extensions
conversion del » conversion _

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