Reteoned or Retained: How To spell?

The word Reteoned is misspelled against Retained, which is past tense of "Retain"

Word contains consecutive vowels 'AI' in between alphabets ret & ned is misspelled as 'EO'
Wrong Spelling:  ret-eo-ned 
Correct Spelling:  ret-ai-ned 
Find more incorrect spellings of Retained to spell right way.

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