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