product_vars(
data = tibble::tibble(
var_av = c("1", "2", "3", "4", "5", NA, "999", "777"),
var_al = c("5", "4", "3", "2", "1", "777", NA, "999"),
var_bv = c("1", "1", "36", "2", "1", NA, "999", "777"),
var_bl = c("5", "2", "2", "2", "1", "777", NA, "999")
),
fork_vars = c("var_al", "var_bl"),
vars = c("var_av", "var_bv"),
keep_values = "2"
)
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