# NOT RUN {
A <- c("a","b","c")
combination(A)
B <- c("a","b","c","d")
C <- c("a","e","h")
D <- c("a","b","e")
E <- c("a","c")
combination(A,B)
combination(A,B,C)
combination(A,B,C,D)
combination(A,B,C,D,E)
# }
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