The word Prexamine is misspelled against Preexamine, a verb meaning "To examine beforehand."
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Preexamine has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Pr & xamine which should not be misspelled with single 'E'
Wrong Spelling:  Pr-e-xamine 
Correct Spelling:  Pr-ee-xamine 
Find more wrongly spelled words of Preexamine to spell it well.