Chegg Question

1 ; p6.scm
2 ; A prototype for program 6 in scheme
3 ;
4 ;
5 ;
6 ;
7 ;
8 ; Edit this file to add your documentation and function definitions.
9 ; Leave the rest of this file unchanged.
14 ;
15 ; Defined LISTS for use with testing your functions.
16 (DEFINE list0 (LIST 'j 'k 'l 'm 'n 'o 'j) )
17 (DEFINE list1 (LIST 'a 'b 'c 'd 'e 'f 'g) )
18 (DEFINE list2 (LIST 's 't 'u 'v 'w 'x 'y 'z) )
19 (DEFINE list3 (LIST 'j 'k 'l 'm 'l 'k 'j) )
20 (DEFINE list4 (LIST 'n 'o 'p 'q 'q 'p 'o 'n) )
21 (DEFINE list5 '((a b) c (d e d) c (a b)) )
22 (DEFINE list6 '((h i) (j k) l (m n)) )
23 (DEFINE list7 '(f (a b) c (d e d) (b a) f) )
24 ;
25 ; Here is a typical function definition
26 (DEFINE (adder lis)
27 (COND
28 ((NULL? lis) 0)
29 (ELSE (+ (CAR lis) (adder (CDR lis))))
30 ))
31 ; The above five lines are the sort of definition you would need to add to
32 ; this file if asked to define an ADDER function.
33 ; Uncomment and complete the following four definitions.
35
36 ; (DEFINE (odds ...
37
38 ; (DEFINE (evenrev ...
39
40 ; (DEFINE (penultimate ...
41
42 ; (DEFINE (palindrome ...