Curtening or Curtaining: How To spell?

The word Curtening is misspelled against Curtaining, which is present continuous of "Curtain"

Word contains consecutive vowels 'AI' in between alphabets curt & ning is misspelled as 'E'
Wrong Spelling:  curt-e-ning 
Correct Spelling:  curt-ai-ning 
Check more misspelled words of Curtaining to spell it correct.

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