Attoned or Attained: How To spell?

The word Attoned is misspelled against Attained, which is past tense of "Attain"

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

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