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hey everyone welcome back and lets write some more neat code today so today lets solve letter combinations of a phone number so were given a string of digits that contain only two through nine so the digits are only going to contain the numbers 2 through 9 and we want to return all possible letter combinations that the number could represent and so basically what this problem is about is like when you wanted to text people with old phones you only had these digits right so in order to have characters youd map a number like two to the characters a b c and you can see the reason were doing two through nine is because one was not mapped to any digits right so we dont need to consider the one two was mapped to abc three was mapped to d e f basically each number or each digit four five six each one was mapped to three characters some were mapped to four characters seven is mapped to four nine is mapped to four different characters so then if youre given a string of digits lets say