Attoning or Attaining: How To spell?

The word Attoning is misspelled against Attaining, which is present continuous of "Attain"

Word contains consecutive vowels 'AI' in between alphabets att & ning is misspelled as 'O'
Wrong Spelling:  att-o-ning 
Correct Spelling:  att-ai-ning 
Find more incorrect spellings of Attaining to spell right way.

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