Caotioning or Cautioning: How To spell?

The word Caotioning is misspelled against Cautioning, which is present continuous of "Caution"

Word contains consecutive vowels 'AU' in between alphabets c & tioning is misspelled as 'AO'
Wrong Spelling:  c-ao-tioning 
Correct Spelling:  c-au-tioning 
Find more incorrect spellings of Cautioning to spell right way.

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