Hrmm....this is what I get:

line 7:
(15) "detsen nested"

line 8:
(0) "i prefer pi"
(2) "prefer pi ip referp"
(9) "pi ip"
[download]

That seems to be correct. Nothing else shows up in line 7, because "testest" isn't a palindrome (but "testseet" is).

I guess it's helpful if you indicate what you think the output should be, so I can short circuit this back and forth :)

Changing line 7 to this:

nested testset detsen nested
[download]

I get this:

line 7:
(0) "nested testset detsen"
(7) "testset"
(15) "detsen nested"
[download]

What did you expect on the 2 lines you added?