Question: Given a string, determine if it is a palindrome or not. A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward, disregarding spaces, punctuation, and capitalization. Example: Input: "A man, a plan, a canal, Panama" Output: True Write a function isPalindrome that takes a string as input and returns True if it is a palindrome, and False otherwise. Constraints: The input string may contain spaces, punctuation marks, and uppercase and lowercase letters. Consider alphanumeric characters only (ignore spaces, punctuation, and case). Note: You should solve this problem using an efficient algorithm that has a time complexity of O(n), where n is the length of the input string.

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