Staoned or Stained: How To spell?

The word Staoned is misspelled against Stained, which is past tense of "Stain"

Word contains consecutive vowels 'AI' in between alphabets st & ned is misspelled as 'AO'
Wrong Spelling:  st-ao-ned 
Correct Spelling:  st-ai-ned 
Find more incorrect spellings of Stained to spell right way.

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