/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		int[] x = new int[]{1, 2, 3};
 
		//for (int i = 0; i < Math.pow(); i++)
		for (int i = 0; i < (1L << x.length); i++)
		{
			String y = i + ": ";
			for (int j = 0; j < x.length; j++)
			{
				if ((i & (1L << j)) != 0) {
					y += x[j] + ", "; 
				}
			}
			System.out.println(y);
		}
	}
}

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