Ǫ
1
2
3
1
1()
2
2()
1/1
2/1
3/1
1/1
1/1
2/1
2/1
1/2
2/2
3/2
1/2
1/2
2/2
2/2
1/3
2/3
3/3
1/3
1/3
2/3
2/3
1/4
2/4
3/4
1/4
1/4
2/4
2/4
1/5
2/5
3/5
2/5
2/5
1/6
2/6
3/6
2/6
1/7
1/8