9
9
0
1
9
9
0
1
8
8
7
0
1
9
7
7
8
1
8
0
8
1
7
8
1
1
9
7
7
8
7
9
9
0
0
8
1
7
1
9
0
8
1
9
0
7
0
0
8
7