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ὅτου

Γηράσκω δ᾽ αἰεὶ πολλὰ διδασκόμενος -> I grow old always learning many things
Solon the Athenian

French (Bailly abrégé)

att. p. οὗτινος, gén. de ὅστις.

English (Abbott-Smith)

ὅτου v.s. ὅστις

English (Strong)

for the genitive case of ὅστις (as adverb); during which same time, i.e. whilst: whiles.

Russian (Dvoretsky)

ὅτου: (= οὗτινος) gen. к ὅστις.