Dereiling or Derailing: How To spell?

The word Dereiling is misspelled against Derailing, which is present continuous of "Derail"

Word contains consecutive vowels 'AI' in between alphabets der & ling is misspelled as 'EI'
Wrong Spelling:  der-ei-ling 
Correct Spelling:  der-ai-ling 
Find more wrongly spelled words of Derailing to spell it well.

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