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