Palindromes, Lipograms and Rhopalics of what exactly? What is the input to each task?

Assignment 2 asks for Palindromes, Lipograms and Rhopalics. I need clarification on following issues: 1. does the longest palindrome in a page refer to the longest substring in the text of a page whose spaces and special characters have been removed and everything converted to lower/upper case? 2. Do the Lipograms refer to words or substrings (as in 1), i.e. the longest substring that does not contain some character? For Rhopalics shall we remove special characters?