Found it on Mr Google.

Don't cheat! Because if you did, the test would be no fun. I promise, there are no tricks to the test.
Read the sentence below and count the F's in that sentence. Count them ONLY ONCE. Do not go back and count them again.
See solutions for your score.

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