player.onChat("3-5", function () {
    let length = 8;
    agent.move(FORWARD, 4);
    for (let i = 0; i < 4; i++) {
        for (let j = 0; j < length; j++) {
            agent.place(DOWN);
            agent.move(RIGHT, 1);
        }
        agent.move(LEFT, length);
        agent.move(BACK, 1);
        length = length - 2;
    }
});