Pleined or Plained: How To spell?

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

Word contains consecutive vowels 'AI' in between alphabets pl & ned is misspelled as 'EI'
Wrong Spelling:  pl-ei-ned 
Correct Spelling:  pl-ai-ned 
Find more wrongly spelled words of Plained to spell it well.

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