class BottlesOfBeerSong {
	private number bottles;
	private string output;
	private string format;
	
	constructor(number bottles) {
		self(bottles, "html");
	}
	
	constructor(number bottles, string format) {
		.bottles = bottles;
		.format = format;
	}
	
	function play() {
		while (.bottles > 0) {
			string bottles = "bottle";
			
			.start();
			
			if (.bottles > 1) {
				bottles += "s";
			}
			
			.line("${.bottles} ${