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