प्रमाण विपर्यय विकल्प निद्रा स्मृतयः ॥६॥
pramāṇa viparyaya vikalpa nidrā smṛtayaḥ ||6||

[RS] 1.6 insight, error, imaginings, deep sleep, and recollections.

[JW] 1.6 Sources-of-valid-ideas and misconceptions and predicate-relations and sleep and memory.

[SS] 1.6 They are right knowledge, misconception, verbal delusion, sleep and memory. [p12]

[TD] 1.6 The five activities are comprehension, misapprehension, imagination, deep sleep, and memory. [p151]

[EB] 1.6 [These five vrttis are] right knowledge, error, imagination, sleep, and memory. [p32]

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(प्रमाण, pramāṇa) = insight; accurate perception; accurate knowledge
(विपर्यय, viparyaya) = error; false perception; false knowledge
(विकल्प, vikalpa) = imagining; illusion; mental construct; the illusion that a semantic construct such as “praise” actually exists
(निद्रा, nidrā) = sleep; deep sleep
(स्मृति, smṛti) = recollections; memory