Given a list of words, some of which start with uppercase characters, convert them all to words in which the first character is lowercase. You can use the words in the dictionary as a good sample set.

Create a function Palindromes[n] that finds all palindromic words of length n in the dictionary. For example, kayak is a five–letter palindrome.

Find the number of unique words in a body of text such as Alice in Wonderland. This text can be imported from ExampleData:

After splitting the text into words, convert all uppercase characters to lowercase so that you count words such as hare and Hare as the same word.

In[1]: ExampleData[{"Text", "AliceInwonderland"}];