ἐκκριτέον
From LSJ
καὶ ὑποθέμενος κατὰ τῆς κεφαλῆς φέρειν τὰς πληγάς, ὡς ἐν ἐκείνῃ τοῦ τε κακοῦ τοῦ πρὸς ἀνθρώπους → and having instructed them to bring their blows against the head, seeing that the harm to humans ... (Josephus, Antiquities of the Jews 1.50)
English (LSJ)
A one must pick out, Pl.Plt.303b.
Greek (Liddell-Scott)
ἐκκρῐτέον: ῥημ. ἐπίθ., δεῖ ἐκκρίνειν, Πλάτ. Πολιτικ. 303Β.
Spanish (DGE)
hay que separar, hay que diferenciar πασῶν ... ἐκείνην (πολιτείαν) Pl.Plt.303b.