Stemed or Stemmed: How To spell?

The word Stemed is misspelled against Stemmed, which is past tense of "Stem"

Stemmed has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings ste & ed which should not be misspelled with single 'M'
Wrong Spelling:  ste-m-ed 
Correct Spelling:  ste-mm-ed 
Explore spell check of Stemmed to spell without errors.

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