IMPORTANT: You should rename the lisp function by appending a "p"
            to the end. 

 store -> storep
 insert -> insertp
 remove -> removep
 delete -> deletep
 modify -> modifyp
 eq     -> eqp
 ..
 ..

* Here is how you define a fexpr function
(defun.fexpr echo (var)
  (car var))

Spatial Data Structure Applets

* Source file to be named "pr4.lsp" that contains the 
  definition of all the functions.

* README: This file should contain your name, 
  your class id and anything special that you want the 
  TA to know when grading your project.

* No late submissions !