Travuling or Travailing: How To spell?

The word Travuling is misspelled against Travailing, which is present continuous of "Travail"

Word contains consecutive vowels 'AI' in between alphabets trav & ling is misspelled as 'U'
Wrong Spelling:  trav-u-ling 
Correct Spelling:  trav-ai-ling 
Check more misspelled words of Travailing to spell it correct.

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