 We depict this example with the following diagram. Inside each circle is a labeling of the truth of each proposition letter for the world whose name is labelled right outside the circle. The arrows indicate the probabilities. For example, an arrow from world \(x\) to world \(z\) labeled by \((b,3/4)\) indicates that from \(x\), the probably of \(z\) under label \(b\) is \(3/4\). Probabilities of 0 are not labelled.