premise: How to set up a chinchilla's cage<br>Choose the right cage. [substeps] Chinchilla cages must be well ventilated to keep the chinchilla cool, thus making metal wire mesh cages a good option. However it's of note that it's easier for the chinchilla to knock messes out of their cage and onto the floor with a wire cage.
hypothesis: A wire cage will be a good choice if you want the floor to stay clean
reason: Statement is exact opposite of the meaning in the passage, the idea was to subvert the message to make floor cleanliness a focal point.