y1 y2 y3 y4 count
0 0 0 0  140
0 0 0 1   31
0 0 1 0   16
0 0 1 1    3
0 1 0 0   17
0 1 0 1    2
0 1 1 0    5
0 1 1 1    1
1 0 0 0   20
1 0 0 1    2
1 0 1 0    9
1 0 1 1    0
1 1 0 0   12
1 1 0 1    1
1 1 1 0    4
1 1 1 1    0