Sproned or Sprained: How To spell?

The word Sproned is misspelled against Sprained, which is past tense of "Sprain"

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

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