Sentence 1: Cornelia has always hated flossing her teeth. 
 Sentence 3: She buys floss but at first she cannot convince herself to use it 
 Sentence 4:  Finally, after learning about tooth decay, she begins to floss 
 Sentence 5:  Cornelia is proud that she has finally begun flossing her teeth 
 Given Sentence 2: However, her dentist tells her that she needs to floss to be healthy.