Prexisted or Preexisted: How To spell?
The word Prexisted is misspelled against Preexisted, which is past tense of "Preexist"
Preexisted has double "ee" is mispronounced as "e"Remember double 'EE' in between the strings Pr & xisted which should not be misspelled with single 'E'
Wrong Spelling:  Pr-e-xisted  Correct Spelling:  Pr-ee-xisted 
Find more wrongly spelled words of Preexisted to spell it well.