Word guessing games are a very common childhood activity. Typically you are told how

many letters are in the word, and then you guess letters. Letter by letter, you either see

more of the word, or you run up against a deadline. Examples of these games are

apple tree, hangman, and even the TV show Wheel of Fortune.

You have decided to go try out for Wheel of Fortune, but you want to put your new found

coding skills to the test first. You are going to write a helper program, which will help

you guess the correct words.

This program will ask you how many letters are in the word, then it$$ll ask you to give it

some letters that you know, and it$$ll show you all the possible words of that length with

those letters.

There are two different ways that you might want to use it$.$ For example you might want

to find all words which have the letters o and p in them in any order. $$Top$$ being an

example, $$Pot$$ being another. But you might also want to be able to find words with a

particular pattern in them, for example, all words with $$pp$$ in them $($such as happy$).$

In order to simplify this, we are going to use a dictionary of the $900$ most common words

in English. When we get to the FileIO Module in a few weeks, you could modify this to

load in a full dictionary which would have $100,000+$ words. Then it would be even more

powerful, but even with the $900$ most common words, it$$ll help a lot.