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undocumented feature stresses
gen.	недекларируемая возможность (Undocumented features are frequently found in computer software releases. Sometimes the documentation is omitted through simple oversight, but undocumented features are often elements of the software not intended for use by end users, but left available for use by the vendor for software support and development. wiki Alexander Demidov); недекларированная возможность (Alexander Demidov)
IT	недокументированное средство
oil	неописанное средство
progr.	недокументированная возможность (ssn)