Obtein or Obtain: How To spell?

The word Obtein is misspelled against Obtain, meaning "to be established accepted or customary"

Word contains consecutive vowels 'AI' in between alphabets obt & n is misspelled as 'EI'
Wrong Spelling:  obt-ei-n 
Correct Spelling:  obt-ai-n 
Find more wrongly spelled words of Obtain to spell it well.

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