digraph foogrph {
	"1/3" -> "1/4";
	"1/3" -> "4/3";
	"3/2" -> "3/5";
	"3/2" -> "5/2";
	"1/2" -> "1/3";
	"1/2" -> "3/2";
	"2/3" -> "2/5";
	"2/3" -> "5/3";
	"3/1" -> "3/4";
	"3/1" -> "4/1";
	"2/1" -> "2/3";
	"2/1" -> "3/1";
	"1/1" -> "1/2";
	"1/1" -> "2/1";
}