The word Prexistence is misspelled against Preexistence, meaning "Existence antecedent to something."
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Preexistence has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Pr & xistence which should not be misspelled with single 'E'
Wrong Spelling:  Pr-e-xistence 
Correct Spelling:  Pr-ee-xistence 
Find more wrongly spelled words of Preexistence to spell it well.