Detailed Instructions: In this task, you are given a paragraph, and your job is to generate comma-separated entities present in the given paragraph. Generate entities from a given passage in such a way that (i) they are present in the paragraph, (ii) they are non-duplicate, (iii) they underwent a state change during the process. Avoid creating entities that (i) aren't present in the process paragraph and (ii) aren't significant. 
Problem:Waves hit the coast. Waves have energy that pushes the water and sediment. The sediment can help erode land like sandpaper. Water washes the sediment back. Some sediment is left as sand. 
Solution:
waves ,coast ,water ,sediment ,land ,sand 