Whats's wrong with this sentence?!
Question: The butterfly landed on
on a flower.
Answers: The butterfly landed on
on a flower.
The word "on" is in the sentence twice.
nothing?
there are two "on"'s?
redundant "on"
''on'' is in the sentence twice
you used the word "on" twice.
uhhh the word on is in the sentence two times in a row
In the butterfly sentence you've used two ("on")s, one of which is unnecessary but most people seem to have picked up on this.
However in your question sentence you have spelt "What's" with two letter s.
Edit: Forgot to state that "this sentence" really should be referring to the question sentence so that the answer is the 2 s's in "what's" rather than the sentence in your question details. I suspect it's just a decoy lol.