The word Diferencing is misspelled against Differencing, which is present continuous of "Difference"
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Differencing has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings Di & erencing which should not be misspelled with single 'F'
Wrong Spelling:  Di-f-erencing 
Correct Spelling:  Di-ff-erencing 
Find more wrongly spelled words of Differencing to spell it well.