החיפוש שביצעת - "((functions computation) or (functions computational)) programming validating cases versus*" - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
functions computational » function computation, directions computational, section computational
programming validating » programming evaluating, programming writing, programming balancing
functions computation » function computation, functions composition, function composition
validating cases » evaluating cases, validating code, validating user
cases versus » cages versus, cash versus, codes versus

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