1
Sources
0
1
0
0
0
1
1
0
0
2
1
0
0
0
2
1
0
0
0
1
0
0
1
1
0
0
0
1
0
0
1
1
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
