Drills tagged with this skill, unpassed first. Pass them all to mark the skill ready for scenarios.
unique_words(sentence) that returns the unique (case-insensitive) words in sentence as a sorted list. Words are space-separated.common_elements(a, b) that returns the items present in both lists, as a sorted list (case-sensitive, dedup any repeats).min_max_avg(numbers) that returns a list [min, max, avg] for a non-empty list. The average should be a float.