Get keys which can be used in venn plot.
get_venn_key(source_key, key_len)The combination of number: 1,2,3,12,13,23,123
The num of different numbers
Binary keys such as 001,010,100...
get_venn_key(c(1,2,3,12,13,23,123), 3)
#> Error in get_venn_key(c(1, 2, 3, 12, 13, 23, 123), 3): could not find function "get_venn_key"