5. How many cans can a canner can if a canner can can cans? A canner can can as many cans as a canner can if a canner can can cans.
6. I thought a thought. But the thought I thought wasn't the thought I thought I thought.
7. She sells seashells by the seashore. The shells she sells are surely seashells. So if she sells shells on the seashore, I'm sure she sells seashore shells.