Task: Sentence Ordering
Input (English): Pollution enters natural water sources such as rivers and lakes
The pollution negatively affects the water quality
The pollution negatively affects the health of plants and animals
The plants and animals have shorter, less healthy lives
The plants and animals do not reproduce very well
The number of plants and animals decreases over time
The quality of water gets worse and worse as there are no plants or animals to clean it
Eventually there is nothing living in the water and it is unusable
Output (English):   Yes