naming(sets1 = c("a", "b"))
naming(sets1 = "a", middle = "union", sets2 = "b")
naming(sets1 = "a", middle = "intersection", sets2 = c("b", "c"))
naming(sets1 = "a", middle = "intersection", sets2 = c("b", "c"))
naming(
start = "complement", sets1 = "a", middle = "intersection",
sets2 = c("b", "c"), collapse_symbol = "intersection"
)
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