Write top_k_words(words, k) returning the k most frequent words, ties alphabetically.
top_k_words(['i', 'love', 'sql', 'i', 'love', 'python'], 2) → ['i', 'love']
top_k_words([], 3) → []
Submit runs 4 tests, including hidden edge cases.
Each hint gives a little more help. Try on your own first.
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