The word Cas is misspelled against Caas, a noun meaning "Case."
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Caas has double "aa" is mispronounced as "a"
Remember double 'AA' in between the strings C & s which should not be misspelled with single 'A'
Wrong Spelling:  C-a-s 
Correct Spelling:  C-aa-s 
Browse incorrect spellings of Caas to spell it good.