Task: Sentence Ordering
Input (English): Sentence1: Jen refused because she did not want Lee to be dipped in chemicals. Sentence2: The veterinarian, Doctor Mike, found three fleas on Lee. Sentence3: Jen brought her cat Lee to the vet for a checkup. Sentence4: Jen noticed that Lee's flea problem quickly got worse. Sentence5: Doctor Mike suggested a flea dip to Jen.
Output (English): 42153