Design a data structure called WordDictionary that supports the following functionalities:

• Constructor: This function will initialize the object.

• Add Word(word): This function will store the provided word in the data structure.

• Search Word(word): This function will return TRUE if any string in the WordDictionary object matches the query word. Otherwise, it will return FALSE. If the query word contains dots, ., each dot is free to match any letter of the alphabet.

  For example, the dot in the string “.ad” can have $26$ possible search results like “aad”, “bad”, “cad”, and so on.

• Get Words(): This function will return all the words in the WordDictionary class.

Constraints:

• $1 \leq$ word.length $\leq 25$

• Words passed to Add Word() consist of lowercase English letters.

• Words passed to Search Word() consist of . or lowercase English letters.

• There will be, at most, three dots in a word passed to Search Word().

• At most, $10^2$ calls will be made to Add Word() , Get Words() and Search Word().

Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Note: The game below is only for the Add Word(word) function.

Implement your solution in word_dictionary.py in the following coding playground. The supporting code template provided in dfs.py is meant to assist in developing your solution to the problem.