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