r1 <- rule(
"first" = c("from ori rule", "FROM ORI RULE"),
"last" = c(NA, "last"),
.to_NA = "X",
.drop = TRUE
)
r2 <- rule(
"first" = c("F", "f"),
"second" = c("S", "s"),
"third" = c("T", "t"),
.to_NA = "something"
)
combine_rules(r1, r2)
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