Winners never quit and quitters never win.
Please provide some examples of proverbs, quips, catch phrases, punch lines having a similar structure i.e. A B C D C' B' A'.
A', B', C' are grammatical alterations of (or exactly equal to) A, B, C.
D stands for one of the (and, but, while ) or (comma, hyphen, empty space)
(In reply to computer plus human finds only one
1st: You were right to expand my narrow definition of the D-word, actually any word is allowed as long as the palindromic nature is present.
2nd: A better data base would be a list of palindromic-by-word phrases, where you should find sentences like:
Fall leaves as soon as leaves fall, and similar..