0
stud
0
0
1
0
1
1
0
0
0
0
0
0
1
0
1
1
0
0
0
0
0
0
1
4
1
0
0
0
0
0
0
0
0
1
0
5
0
2
3
1
1
2
0
2
2
1
0
2
1
3
0
0
0
0