Overlan or Overlain: How To spell?

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

Word contains consecutive vowels 'AI' in between alphabets overl & n is misspelled as 'A'
Wrong Spelling:  overl-a-n 
Correct Spelling:  overl-ai-n 
Explore spell check of Overlain to spell without errors.

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