RosettaCodeData/Task/Remove-duplicate-elements/Nanoquery/remove-duplicate-elements.nanoquery

items   = {1, 2, 3, "a", "b", "c", 2, 3, 4, "b", "c", "d"}
unique  = {}

for item in items
    if not item in unique
        unique.append(item)
    end
end