The word Mumying is misspelled against Mummying, which is present continuous of "Mummy"
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Mummying has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings mu & ying which should not be misspelled with single 'M'
Wrong Spelling: mu-m-ying
Correct Spelling: mu-mm-ying
Check more misspelled words of Mummying to spell it correct.