Challenge 1: Unique Word Lengths — Possible Solution
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sentence = "the quick brown fox jumps over the lazy dog"

lengths = {len(word) for word in sentence.split()}

print(lengths)

Output:
{3, 4, 5}

WHY THIS WORKS AS AN ANSWER
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sentence.split() reuses the Course 1 string-splitting method to turn
the sentence into a list of individual words: ['the', 'quick',
'brown', 'fox', 'jumps', 'over', 'the', 'lazy', 'dog'].

{len(word) for word in sentence.split()} reuses this chapter's own set
comprehension shape exactly — {expr for item in iterable} — with
len(word) as the expression, computing each word's length (reusing
len() from Course 1) rather than collecting the words themselves.

Because it's a SET comprehension rather than a list comprehension,
duplicate lengths automatically collapse into one entry, the same
deduplication behavior demonstrated in the chapter's own lengths =
{len(word) for word in words} example. Here, "the" (length 3) appears
twice in the sentence, but 3 only appears once in the resulting set —
the final result is just the distinct lengths present: 3 (the, fox,
dog), 4 (over, lazy), and 5 (quick, brown, jumps).