Prepiad or Prepaid: How To spell?

The word Prepiad is misspelled against Prepaid, which is past tense of "Prepay"

Word contains consecutive vowels 'AI' in between alphabets prep & d is misspelled as 'IA'
Wrong Spelling:  prep-ia-d 
Correct Spelling:  prep-ai-d 
Find more wrongly spelled words of Prepaid to spell it well.

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