outcome leg arm head
      1    0   1   0
      1    1   0   1
      1    0   1   1
      0    1   0   0
      0    0   1   0
      0    0   1   1
      1    1   0   0
      0    1   0   1
      1    0   0   0
      0    0   0   0
      0    1   0   0
      1    0   1   0
      0    1   0   0
      0    0   0   1
      1    1   1   0
      0    1   1   0

outcome leg arm head successful
   1     0   1   0      0.666