Stemata or Stemmata: How To spell?

The word Stemata is misspelled against Stemmata, which is plural of "Stemma"

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

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