<div class="leaf flex"><div class="inner justify"><h4>More Questions</h4><ul><li>You are given a 7 digit phone number, and you should find all possible letter combinations based on the digit-to-letter mapping on numeric pad and return only the ones that have valid match against a given dictionary of words.</li><li>Give all possible letter combinations from a phone number.</li><li>Generate all subsets of a string.</li><li>Print all possible N pairs of balanced parentheses.
E.g. when N is 2, the function shou