h <- hier_create(root = "Total", nodes = LETTERS[1:2])
h <- hier_add(h, root = "A", nodes = c("a1", "a2"))
h <- hier_add(h, root = "B", nodes = c("b1", "b2"))
h <- hier_add(h, root = "b1", nodes = "b1a")
hier_display(h)
h <- hier_delete(h, nodes = c("a1", "b1a"))
hier_display(h)
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