50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
50
0
0
49
0
0
49
0
0
49
0
0
