>addsensor(50, 0, 0, 1);
>addsensor(70, 0, 50);   # 1-Anti-collision sensor

            : move(100, 100) . turretset(180);
random(1, 8): move(70, 100);
random(1, 8): move(100, 70);
sense(0)    : fire();
sense(1)    : move(-0, 100);