The word Overpasing is misspelled against Overpassing, which is present continuous of "Overpass"
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Overpassing has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings overpa & ing which should not be misspelled with single 'S'
Wrong Spelling:  overpa-s-ing 
Correct Spelling:  overpa-ss-ing 
Find more wrongly spelled words of Overpassing to spell it well.