When we write things down, it's important to keep things nice and clear, so it's easy to read. Sentences help us give an order, ask a question, state a fact, or express an emotion or idea. Words are ...

At each step, each cell of the grid represents either a tree, a fire, or a burnt tree. If a cell is on fire, adjacent trees* can burn with some probability. At the next step, all cells on fire are ...