The word Casation is misspelled against Cassation, a noun meaning "The act of annulling."
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Cassation has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings ca & ation which should not be misspelled with single 'S'
Wrong Spelling:  ca-s-ation 
Correct Spelling:  ca-ss-ation 
Find more incorrect spellings of Cassation to spell right way.