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From LSJ

ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλοςlife is not worth living if you do not have at least one friend

Source

German (Pape)

[Seite 884] τό, schlechtere Schreibung statt σείριον, s.σείριος.