The word Prexisting is misspelled against Preexisting, which is present continuous of "Preexist"
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Preexisting has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Pr & xisting which should not be misspelled with single 'E'
Wrong Spelling: Pr-e-xisting
Correct Spelling: Pr-ee-xisting
Find more wrongly spelled words of Preexisting to spell it well.