<Arrinao> sentence = input("Enter a sentence: ") <Arrinao> counts = {} <Arrinao> for word in sentence.split(): <Arrinao> counts[word] = counts.get(word, 0) + 1 <Akuli> two cases: word is not in counts, word is in counts <Akuli> word not in counts: counts[word] = 0+1 <Akuli> s o when we see it for the first time, set count to 1 <Akuli> and when word is in counts, it does: counts[word] = counts[word] + 1 <Akuli> so when we see a word we already saw before, we increment the count