0
natural
0
1
3
2
3
1
0
2
0
1
0
2
0
0
0
1
0
0
0
0
1
0
2
2
3
3
1
0
0
1
1
0
1
1
0
0
0
1
1
1
4
4
2
3
2
0
4
1
4
