The word Mufling is misspelled against Muffling, which is present continuous of "Muffle"
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Muffling has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings Mu & ling which should not be misspelled with single 'F'
Wrong Spelling: Mu-f-ling
Correct Spelling: Mu-ff-ling
Check more misspelled words of Muffling to spell it correct.