The word Stuming is misspelled against Stumming, which is present continuous of "Stum"
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Stumming has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings stu & ing which should not be misspelled with single 'M'
Wrong Spelling: stu-m-ing
Correct Spelling: stu-mm-ing
Check more misspelled words of Stumming to spell it correct.