0 |a :1 :2 :3
1 |a :1 :2 :3
0 |a :1 :2 :3
1 |a :1 :2 :3
0 |a :1 :2 :3
1 |a :1 :2 :3
0 |a :1 :2 :3
1 |a :1 :2 :3
0 |a :1 :2 :3
1 |a :1 :2 :3
