var times = 0;

while(times != 20)
{
	for(var i = 1; i < 4; i++)
	{
		actions.setRedstoneOutput(getFace(i), true);
		actions.sleep(500);
		actions.setRedstoneOutput(getFace(i), false);
	}
	times++;
}

function getFace(i)
{
	if(i == 1)
	{
		return "north";
	}
	else if(i == 2)
	{
		return "east";
	}
	else if(i == 3)
	{
		return "south";
	}
	else if(i == 4)
	{
		return "west";
	}
}