Function NTHREST

{tt nthrest} returns the list specified as its first argument
minus the first $n$ items, where $n$ is the number specified as its second argument.
Arity: 3
Axioms:
(Nth-Domain Nthrest 3 List)

(Nth-Domain Nthrest 2 Natural)

(Nth-Domain Nthrest 1 List)

(=> (Nthrest ?List ?N ?New-List)
    (= ?New-List
       (Cond ((= ?N 0) (If (List ?List) ?List))
             ((Positive ?N) (Nthrest (Rest ?List) (1- ?N))))))