You can read the task, take hints and check your answer — but nothing is saved. No XP, no skill points, and this task will not be marked complete.
Write `unique_words(text)` that returns how many *distinct* words a string contains, ignoring case.
What this proves: Choose the right collection type for the problem — sets for uniqueness, lists for order.
Need assistance? You can reveal sequential hints. Each hint applies a minor penalty to your score.
If you are completely stuck, you can unlock the full step-by-step walkthrough.