The word Clases is misspelled against Classes, which is plural of "Classis"
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Classes has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings cla & es which should not be misspelled with single 'S'
Wrong Spelling: cla-s-es
Correct Spelling: cla-ss-es
Explore spell check of Classes to spell without errors.