Pertoned or Pertained: How To spell?

The word Pertoned is misspelled against Pertained, which is past tense of "Pertain"

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

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