γραμματιστική
From LSJ
Βέβαιον οὐδέν ἐστιν ἐν θνητῷ βίῳ → Nihil, ut videtur, proprium in vita datur → Nichts Festes gibt's im Leben eines Sterblichen
English (LSJ)
ἡ, elementary teaching, Phld.Rh. 1.70S., S.E.M.1.44, Them.Or.23.297d (also γραμματιστικά, τά, Id.Or.21.251a): but distinguished from γραμματική as more elementary, Ph.1.540.
Russian (Dvoretsky)
γραμμᾰτιστική: ἡ (sc. τέχνη) искусство обучения грамоте Sext.