Overstraoning or Overstraining: How To spell?

The word Overstraoning is misspelled against Overstraining, which is present continuous of "Overstrain"

Word contains consecutive vowels 'AI' in between alphabets overstr & ning is misspelled as 'AO'
Wrong Spelling:  overstr-ao-ning 
Correct Spelling:  overstr-ai-ning 
Find more incorrect spellings of Overstraining to spell right way.

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