Write a program to implement and test a recursive function for a palindrome. A palindrome is an alphanumeric string such that the string reads the same in the forward and backward directrion.

To implement a recursive function that checks if a string is a palindrome, we need to compare the characters from the beginning and the end of the string, progressively narrowing the comparison toward the center. A palindrome is a string that reads the same forwards and backwards, so for a string to be a palindrome, the first character must match the last one, the second character must match the second-last one, and so on.

### Steps for the Program:

1. Base Case: 
   - If the string is empty or contains only one character, it is a palindrome by default because there is nothing ______ _________ _____ ________ __________ _________ ________ _______.
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