Overlaon or Overlain: How To spell?

The word Overlaon is misspelled against Overlain, which is past perfect of "Overlie"

Word contains consecutive vowels 'AI' in between alphabets overl & n is misspelled as 'AO'
Wrong Spelling:  overl-ao-n 
Correct Spelling:  overl-ai-n 
Find more incorrect spellings of Overlain to spell right way.

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