What variation technique is used to devolp the motive in measures 17-20 (refer to picture)

Explanation:

the notes are going up and down as you can see, they are all upside sown which means it's a low level meet or also knowna s a low level rhythm with 1 rest, it is a sad song.

i came across this and i found it funny that when you're bored you play hangman on so im going to guess a : )