void main() {
    int x = 12;
    if (x > 10) {
        if (x > 20) {
            IO.println("big");
        } else {
            IO.println("medium");
        }
    } else {
        IO.println("small");
    }
}

// From Groundwork, chapter 4 (ch04-making-decisions), box 17.
// This example is from Groundwork, licensed CC BY-NC-SA 4.0.
// Run with: java ch04_17.java