Assertion: whale's song | /r/CapableOf | change over time
Facets:
value: gradually
type: MANNER
Source sentences:
text: Over time, the song will change, and if the new song is catchy enough, it will spread to other populations of whales.
text: Over time the song gradually changes.
text: Over time the song may change but all the singing males will remain in tune with one another.