L0: Is D1 = B? (yes=L1)
  L1: 0 happens  8  times.
L0: Is D1 = A? (yes=L2)
  L2: 1 happens  5  times.
L0: Is D1 = C? (yes=L3)
  L3: Is D2 = A? (yes=L5)
    L5: 0 happens  1  times.
  L3: Is D2 = B? (yes=L6)
    L6: 1 happens  1  times.
L0: Is D1 = D? (yes=L4)
  L4: 1 happens  1  times.

