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