The word Duning is misspelled against Dunning, which is present continuous of "Dun"
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Dunning has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings du & ing which should not be misspelled with single 'N'
Wrong Spelling: du-n-ing
Correct Spelling: du-nn-ing
Check more misspelled words of Dunning to spell it correct.