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In this video tutorial, the narrator explains how to reduce space complexity by using an iterative approach to solve a problem involving combinations of letters and phone numbers. They demonstrate creating a dictionary with numbers as keys and letters as values, using a stack data structure to store index and string information, and initializing a combination array. The iterative method involves iterating over letters in each digit and pushing tuples to the stack. This approach helps to efficiently solve the problem while reducing space complexity.
