player.onChat("19-4", function () {
    player.say("等間隔の枠以外の場所に鉱石を置きます");
    const MOVE_COUNT: number = 10;
    const SPAN: number = 4;
    for (let i: number = 0; i < MOVE_COUNT; i++) {
        let mod_i = i % SPAN;
        if (mod_i > 0) {
            placeOre();
        }
        agent.move(FORWARD, 1);
    }
    player.say("鉱石を置きました");
});