The word Duling is misspelled against Dulling, which is present continuous of "Dull"
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Dulling has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings du & ing which should not be misspelled with single 'L'
Wrong Spelling: du-l-ing
Correct Spelling: du-ll-ing
Check more misspelled words of Dulling to spell it correct.