READ this sentence: FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS. Now count aloud the F''s ONLY ONCE in that sentence. Count them ONLY ONCE; do not go back and count them again. See below... ANSWER: There are six F''s in the sentence. There is no catch. Many people forget the OFs. The human brain tends to see them as "V''s" instead of "F''s".