gen_char(from = "g", n = 5)
gen_char(to = "g", n = 5)
gen_char(from = "g", to = "j")
gen_char(from = "t", n = 5, random = TRUE)
gen_char(
from = "x", n = 5, random = TRUE,
allow_dup = FALSE, add = c("+", "-")
)
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