Apprasing or Appraising: How To spell?

The word Apprasing is misspelled against Appraising, which is present continuous of "Appraise"

Word contains consecutive vowels 'AI' in between alphabets appr & sing is misspelled as 'A'
Wrong Spelling:  appr-a-sing 
Correct Spelling:  appr-ai-sing 
Find more wrongly spelled words of Appraising to spell it well.

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