Try to count it
how many "F" are there in the paragraph???

FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE
EXPERIENCE OF YEARS

Finish???
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izit 3
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actually it's 6
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Let's try once more
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FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE
EXPERIENCE OF YEARS

haha

this is bcoz our brain cannot enterpret "of"

Unbelievable???

haha