cc("a,b,c,d,e")
cc(" a , b , c , d , e ")
cc(" a , b , c , d , e ", trim=FALSE)
cc("1, 2, 3, 4, 5")
cc("A 1 , B 2 ; C 3 | D 4 \t E 5")
cc("A, B, C",
" D | E ",
c("F", "G"))
cc("
American
British
Chinese
")
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