Count how many letters ''F'' the following text has. Without using the mouse or finger. Do it quickly: ''FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS''
How many?

6.
The brain hardly manages to process the word OF.

Count how many letters ''F'' the following text has. Without using the mouse or finger. Do it quickly: ''FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS''
How many?

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