"You brought me new sand!"

Rama and Raba came for a visit on Thursday afternoon. When they arrived, Raba said, "let's get your wagon and go see what I have in my trunk."

Ian gasped and exclaimed, "YOU BROUGHT ME NEW SAND!"

Rama asked, "now, how did he know that?"

Well, he knew Raba brought him sand before. He knew he was out of sand. (This can happen when you consistently throw it over the deck railing, even when repeatedly told it will be gone forever if you do.) He knew that whatever Raba was talking about had to be big enough to need to ride in the wagon. QED, Raba brought him more sand.