Contoned or Contained: How To spell?

The word Contoned is misspelled against Contained, which is past tense of "Contain"

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

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