Tweun or Twain: How To spell?

The word Tweun is misspelled against Twain, an adjective meaning "Two; -- nearly obsolete in common discourse, but used in poetry and burlesque."

Word contains consecutive vowels 'AI' in between alphabets tw & n is misspelled as 'EU'
Wrong Spelling:  tw-eu-n 
Correct Spelling:  tw-ai-n 
Check more misspelled words of Twain to spell it correct.

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