The word Mutering is misspelled against Muttering, which is present continuous of "Mutter"
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Muttering has double "tt" is mispronounced as "t"
Remember double 'TT' in between the strings mu & ering which should not be misspelled with single 'T'
Wrong Spelling: mu-t-ering
Correct Spelling: mu-tt-ering
Check more misspelled words of Muttering to spell it correct.