Write php code that finds all possible words from a set of letters, we will start by generating all permutations of your random letters. Then generate all substrings of all the permutations. Then find all permutations of that set. This is the set of all possible words from your initial set of letters. There may be duplicates. Find a way to avoid the duplicates (an associative array or a set will work for this). This php file will need to display all possible words.