Task: Sentence Ordering
Input (English): Sentence1: I sat down with my grandpa and he taught me. Sentence2: When I was a kid I really wanted to play checkers. Sentence3: As I got older, I continued to play checkers with him. Sentence4: I have very fond memories of checkers. Sentence5: At first, he was just teaching me but it became a special thing.
Output (English): 21453