Definition: You will be given three sentences. Read them, then identify a noun phrase (person, place, or thing) or event that is shared between all three sentences. As the output, write the span of the text corresponding to that phrase in each sentence. Keep the order of the sentences, that is, your answer should look like: 1: *a phras from sentence 1e* 2: *a phras from sentence 2* 3: *a phrase from sentence 3*
Input: 1: The subjects were then asked to rate the photos according to how unpleasant or pleasant they were . 2: Those who took the acetaminophen rated all the photos less extremely than those who took the placebo . 3: Subjects taking acetaminophen reacted less strongly to both pleasant and unpleasant photos .

1: The subjects 2: Those who took the acetaminophen 3: Subjects taking acetaminophen