Which figure of speech is used in this text?
Those images that yet
Fresh images beget,
That dolphin-torn, that gong-tormented sea.
—W. B. Yeats, "Byzantium"

 - assonance
 - chiasmus
The text uses assonance, the repetition of a vowel sound in a series of nearby words.
The words yet, fresh, beget, and tormented share a vowel sound.