player.onChat("20-3", function () {
    player.say("柱を調べて、はしを1つずつ取り除きながら柱を並べます");
    let tower: number[] = [0, 0, 0, 0, 0];
    inspectPillar(tower);
    for (let i: number = 0; i < 3; i++) {
        tower.pop();
        agent.move(RIGHT, 1);
        buildPillar(tower);
    }
    player.say("柱を並べました");
});