The word Overstreined is misspelled against Overstrained, which is past tense of "Overstrain"
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Word contains consecutive vowels 'AI' in between alphabets overstr & ned is misspelled as 'EI'
Wrong Spelling:  overstr-ei-ned 
Correct Spelling:  overstr-ai-ned 
Find more wrongly spelled words of Overstrained to spell it well.