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