Abstuned or Abstained: How To spell?

The word Abstuned is misspelled against Abstained, which is past tense of "Abstain"

Word contains consecutive vowels 'AI' in between alphabets abst & ned is misspelled as 'U'
Wrong Spelling:  abst-u-ned 
Correct Spelling:  abst-ai-ned 
Check more misspelled words of Abstained to spell it correct.

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