εἴπερ καλὰ κτἑ.: the argument, made according to the modus tollendo ponens with natural abbreviations, rests on the exposition made in 474 d f.
τὴν ὠφελίαν: cognate accusative. After ὑπολαμβάνω we must supply ὠφελεῖσθαι. The asyndeton which follows is of the very common explanatory class.
ἆρα οὖν: introduces a new section of the argument, regarding the statement advanced by Socrates in 469 b.
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