Exercise 4.2
Suppose we are given a knowledge base with the following facts:
.(tran(neun,nineWrite a predicate

listtran(G,E) which translates a list of German number words to the corresponding list

of English number words. For example:
should give:
.[X = [one,nine,two

Your program should also work in the other direction. For example, if you give it the query
it should return:
.[X = [eins,sieben,sechs,zwei
Hint: to answer this question, first ask yourself `How do I translate the empty list of number words?'. That's
the base case. For non-empty lists, first translate the head of the list, then use recursion to translate the tail.