# use list as input
a <- list(`Set 1` = c(1, 3, 5, 7),
`Set 2` = c(1, 5, 9),
`Set 3` = c(1, 2, 8),
`Set 4` = c(6, 7))
ggvenn2(a, c("Set 1", "Set 2"))
ggvenn2(a, c("Set 1", "Set 2", "Set 3"))
ggvenn2(a)
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