"The 's in the 's of the 's sounded terrible."
Explanation:
* Cacophony is the use of harsh or jarring sounds in writing, often for a particular effect.
* The repeated "s" sounds in the original sentence create an unpleasant, almost jarring effect.
* Elision is the omission of sounds or syllables in a word, usually for smoother pronunciation.
* In this case, we could use elision to smooth out the sentence: "The 's in the 's of the 's sounded terrible."
The elision of the second "s" in "of the 's" creates a more natural and less cacophonous flow.