using System;
using System.Collections.Generic;
using System.Linq;

public class Test
{
	public static void Main()
	{
		List<string> a1 = new List<string> { "foo", "bar", "foo" };
        List<string> a2 = new List<string> { "bar", "foo", "bar" };
        
        IEnumerable<string> inFirstOnly = a1.Except(a2);
    	IEnumerable<string> inSecondOnly = a2.Except(a1);
    	bool allInBoth = !inFirstOnly.Any() && !inSecondOnly.Any();
        
        Console.WriteLine("allInBoth: " + allInBoth);
	}
}