REP    a    b    c    d    freq
25    0    0    0    0      3
25    0    0    0    1      8
25    0    0    1    0     10
25    0    0    1    1     43
25    0    1    0    0      5
25    0    1    0    1      3
25    0    1    1    0      8
25    0    1    1    1      5
25    1    0    0    0      9
25    1    0    0    1      4
25    1    0    1    0      3
25    1    0    1    1      9
25    1    1    0    0     69
25    1    1    0    1     11
25    1    1    1    0      9
25    1    1    1    1      1