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ἐπί

(prep.) on (+ gen); on, pertaining to, on condition that (+ dat); onto, over, against, for (purpose) (+ acc) [ἐπ’ before smooth breathing, ἐφ’ before rough breathing, ἐπι before consonants]

εἰς

(prep. + Acc) ’toward, into’ [also ἐς, which is also prev.] sometimes a misprint of m. Nom Sg of εἷς (num.) ’one’