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