local function make_list(sep)
    local counter = 0
    local function make_item(name)
        counter += 1
        return $"{counter}{sep}{name}"
    end
    local items = {}
    for {"first", "second", "third"} as name do
        items:insert(make_item(name))
    end
    print(items:concat("\n"))
end

make_list(". ")