Grace and Books

Grace brought me one of Aimee's library books today and informed me that there were words in it.  I agreed.  Then she said, "Jesus."  "Jesus is in the book?" I asked.  "No - the hay," said Grace.  "The hay?"  "For the animals," she said, and then elaborated, "Jesus made the hay for the animals at the rrrrrr zoo."  I asked and asked, but I never did find out what rrrrrrr meant.