Chapter 378A School Grammar of Attic GreekDickinson CollegeChristopher Francese
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378 In the root-aorist the indicative active lacks the singular; instead are used forms of a κα-aorist- like the σα-aorist, but
with κ for σ.
This κα-formation sometimes occurs in the plural and dual,
and occasionally in the middle: ἔθηκαν, ἐδώκαμεν, προήκαντο.