Preobtean or Preobtain: How To spell?

The word Preobtean is misspelled against Preobtain, a verb meaning "To obtain beforehand."

Word contains consecutive vowels 'AI' in between alphabets preobt & n is misspelled as 'EA'
Wrong Spelling:  preobt-ea-n 
Correct Spelling:  preobt-ai-n 
Find more incorrect spellings of Preobtain to spell right way.

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