Pleoned or Plained: How To spell?

The word Pleoned is misspelled against Plained, which is past tense of "Plain"

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

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