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確認 / かくにん - (noun/する verb) confirmation, verification, validation, review, check, affirmation, identification
明確 / めいかく - (Adjective/-な) clear, precise, definite, distinct
正確 / せいかく - (Adjective/-な) accurate, correct, precise, exact
確実 / かくじつ - (Adjective/-な) certain, sure, definite, reliable, sound, solid, safe, secure
確か / たしか - (Adverb/-な) sure, certain, positive, definite; reliable, trustworthy, safe, sound, firm, accurate, correct, exact; {adv} If I'm not mistaken, If I remember correctly, If I remember rightly