LISP PROGRAMMING

Please use RACKET and explain each step with comments.

Write a function flat which takes any list and return a new list of all atomic items in the original list in the original order. For example, e (flat '(a boc d e f))) returns (list 'a, 'b, c, d, 'e, 'f) (flat '(((1 4 8)))) returns (list 1 4 8)