how many "F"'s are in this sentence?

FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS.

• One of average intelligence finds three of them.
• If you spotted four, you're above average.
• If you got five, you can turn your nose at most anybody.
• If you caught six, you are a genius.

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