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