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hello everyone I hope you are all doing well in the last video we used the recursion approach to solve the problem of leather combination and the phone numbers but the space complexity was of three to the power n so how we can reduce the space complexity and this word is by using the iterative approach so in this video I will show you how to solve this problem using the iterative method so lets get started lets say for example the output is 23. the first thing were going to do is to create a dictionary called font thats going to have the numbers as the keys and the letter as a values then were going to create a stack data structures and store the index and the current string at each iteration as a tuple starting with zero as index and an empty string then initialize an empty array called combination to be the out after that were gonna start with rating over the letter inside the first digit and at each index of the stack we push a tuple contains an increment index and the let le
