Constron or Constrain: How To spell?

The word Constron is misspelled against Constrain, meaning "compel"

Word contains consecutive vowels 'AI' in between alphabets constr & n is misspelled as 'O'
Wrong Spelling:  constr-o-n 
Correct Spelling:  constr-ai-n 
Find more incorrect spellings of Constrain to spell right way.

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