how many F you found?

I just read a email..quite fun so wanna share it with you all..

Now,find our how many ''F'' in the following sentence

FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
ST UDY COMBINED WITH THE
EXPERIENCE OF YEARS

How many?3 F?
YOU ARE WRONG~!!
THERE ARE 6 F..
DUN BELIEVE ME?
COUNT AGAIN~

FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
ST UDY COMBINED WITH THE
EXPERIENCE OF YEARS

You know why?Because our brain cant digest OF~
fun rite?hehe..