Where does “ἐκκολάπτω” come from?

ἐκκολάπτω (Ancient Greek) comes from Ancient Greek κολάπτω, from Ancient Greek κόλᾰφος, from Ancient Greek *-ϳω — builds a verb stem either from a root or from a nominal. Both the reflex of ϳ and the thematicization, which together constitute this suffix, are omitted in the aorist and perfect stem.

Ancestry of “ἐκκολάπτω”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	κολάπτω	to peck
2	Ancient Greek	κόλᾰφος	a buffet, a blow
3	Ancient Greek	*-ϳω	builds a verb stem either from a root or from a nominal. Both the reflex of ϳ and the thematicization, which together constitute this suffix, are omitted in the aorist and perfect stem

Every word from Ancient Greek *-ϳω →Every word from Ancient Greek κόλᾰφος →Every word from Ancient Greek κολάπτω →