Overstrining or Overstraining: How To spell?

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

Word contains consecutive vowels 'AI' in between alphabets overstr & ning is misspelled as 'I'
Wrong Spelling:  overstr-i-ning 
Correct Spelling:  overstr-ai-ning 
Find more wrongly spelled words of Overstraining to spell it well.

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