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