The word Ses is misspelled against Sess, a noun meaning "A tax; an assessment. See Cess."
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Sess has double 'ss' in the end mispronounced as 's'
Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  se-s 
Correct Spelling:  se-ss 
Explore spell check of Sess to spell without errors.