Task: Sentence Ordering
Input (English): Sentence1: The veterinarian confirmed that Tigger did indeed have fleas. Sentence2: They gave him a flea medication and it cleared up. Sentence3: Tigger was constantly scratching himself day and night. Sentence4: Alex suspected that his cat Tigger might have fleas. Sentence5: Alex took Tigger to the veterinarian to be diagnosed.
Output (English): 45213