Retuling or Retailing: How To spell?

The word Retuling is misspelled against Retailing, which is present continuous of "Retail"

Word contains consecutive vowels 'AI' in between alphabets ret & ling is misspelled as 'U'
Wrong Spelling:  ret-u-ling 
Correct Spelling:  ret-ai-ling 
Check more misspelled words of Retailing to spell it correct.

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