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map 1:2

I want to write a function that will create a list with two items for
every 1 item in another list. I am currently using map to create a 1:1
list like so

       (lambda (x)
        `(li x))
       '("one", "two","three"))) =>
   (li "one")
   (li "two")
   (li "three"))

but i want it to have two items foreach one like this

   (dt "one")
   (dd "ONE")
   (dt "two")
   (dd "TWO")
   (dt "three")
   (dd "THREE"))

anyone know how i can do that with a map or will i need to write a new map
that does what i want?