12 I in a F

Another reader of this page asks:

"I've been given a puzzle where I have to find words that fit in place of the single capital letters in this sentence:


There are 12 I in a F.

The single letters are to be replaced with words that start with the provided letter."


I'm sure most of you can figure it out soon enough--hopefully the reader who asked the question won't stub their toe in their haste to solve this little stumper.