Question: Write a recursive method that determines whether its argument string is a palindrome. Any non-letter character (e.g. spaces, punctuation, or numbers) should not be considered

Write a recursive method that determines whether its argument string is a palindrome. Any non-letter character (e.g. spaces, punctuation, or numbers) should not be considered as part of the string. Upper and lower case should be considered equal for comparison. public static boolean isPalindrome(String str) { // insert your code here }

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