package?arithmetic;

import?java.util.ArrayList;
import?java.util.List;

public?class?MyComposite?{
	static?int?level=-1;
	static?int?count?=?1;
	static?int?selected?=?3;
	public?static?void?main（String[]?args）{
		char?buf[]={‘a‘‘b‘‘c‘‘d‘};?
		List?container?=?new?ArrayList（）;
		composite（containerbuf0buf.length）;
	}
	public?static?void?composite（List?containerchar?buf[]int?startint?end）{
		if（container.size（）==?selected）{
			for（int?i=0;i				System.out.print（container.get（i））;
			}
			System.out.pr