Curtuling or Curtailing: How To spell?

The word Curtuling is misspelled against Curtailing, which is present continuous of "Curtail"

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

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