Tavtologizing or Tautologizing: How To spell?

The word Tavtologizing is misspelled against Tautologizing, which is present continuous of "Tautologize"

Word contains consecutive vowels 'AU' in between alphabets t & tologizing is misspelled as 'AV'
Wrong Spelling:  t-av-tologizing 
Correct Spelling:  t-au-tologizing 
Find more incorrect spellings of Tautologizing to spell right way.

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