BRIAN YU: In the Size function, you'll need
to return the number of words that are in your dictionary.
There are a number of ways you might do that.
You might imagine iterating over every single one of the linked lists
inside of your hash table, counting the number of nodes
inside of each of the linked lists.
Or you could imagine that, as you're loading the hash table,
you could somehow keep track of the number of words
you've added to the dictionary so far so you can return that value in your Size
function.