The word Pref is misspelled against Preef, a noun meaning "Proof."
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Preef has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Pr & f which should not be misspelled with single 'E'
Wrong Spelling:  Pr-e-f 
Correct Spelling:  Pr-ee-f 
Explore spell check of Preef to spell without errors.