Sentence:The symptoms of H1N1 [e1]flu[/e1] include fever, cough, sore throat, runny or stuffy nose, body aches, headache, [e2]chills[/e2], fatigue, and possibly vomiting or diarrhea.
 e1: flu. 
 e2 : chills.
Answer: Cause-Effect(e1,e2)