/**
 * Mastery Book 20
 */
function start() {
	im.sendYesNo("Would you like to use your Mastery Book 20?");
}

function action(mode, type, selection) {
	if (mode > 0) {
		if (im.haveItem(2431789, 1)) {
			im.useMasteryBook(true);
			im.gainItem(2431789, -1);
		}
	}
	im.dispose();
}