The word Trepaning is misspelled against Trepanning, which is present continuous of "Trepan"
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Trepanning has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings trepa & ing which should not be misspelled with single 'N'
Wrong Spelling: trepa-n-ing
Correct Spelling: trepa-nn-ing
Find more wrongly spelled words of Trepanning to spell it well.