Constrianing or Constraining: How To spell?

The word Constrianing is misspelled against Constraining, which is present continuous of "Constrain"

Word contains consecutive vowels 'AI' in between alphabets constr & ning is misspelled as 'IA'
Wrong Spelling:  constr-ia-ning 
Correct Spelling:  constr-ai-ning 
Find more incorrect spellings of Constraining to spell right way.

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