Returns items in EXACTLY the combination of sets listed in `sets` — that is, in every set in `sets` AND in none of the other sets in the dataset.
Examples
ds <- methods::new("VennDataset",
set_names = c("A", "B", "C"),
items = list(A = c("x", "y"), B = c("y", "z"), C = c("z", "w")),
item_order = c("x", "y", "z", "w"),
universe_size = 10L, source_path = NULL, format = "csv")
res <- analyze(ds)
exclusive_items(res, c("A", "B")) # "y" (in A and B, not in C)
#> [1] "y"