Twan or Twain: How To spell?

The word Twan 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 'A'
Wrong Spelling:  tw-a-n 
Correct Spelling:  tw-ai-n 
Browse incorrect spellings of Twain to spell it good.

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