Teacher: Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Who did the Han Chinese want to help the Khitan no I mean the Mongols fight?
Solution: Who did the Han Chinese want to help the Mongols fight?
Reason: The input initially means Khitan and then changes to Mongols, hence this is correct.

Now, solve this instance: What do Euplokamis stationis or actually I mean Bathyctena chuni and Euhamphaea veilligera only produce when they change color?
Student:
What do Bathyctena chuni, Euplokamis stationis and Euhamphaea veilligera produce only when they change color?