d   4 3 2 1
-   - - - -
  - 0 0 0 0
1 - 0 0 0 1
2 - 0 0 1 0
3 - 0 0 1 1
4 - 0 1 0 0
5 - 0 1 0 1
6 - 0 1 1 0
7 - 0 1 1 1
8 - 1 0 0 0

1 2 3 4 5 6 7 8
- - - - - - - -
0 0 0 0 0 0 0 0   <- Input signals
0 0 0 0           <- Output


0 0 1 0 0 0 0     <- Input signals
0 0 1 1           <- Output

0 1 0 0 1 0 0 0   <- Input signals
0 0 1 0           <- Output sequence
0 1 0 1           <-
0 0 1 0           <-
0 1 0 1           <-
0 0 1 0
0 1 0 1

0 0 1 1 1 1 1 0    <- Input signals
0 0 1 1            <- Output sequence
0 1 0 0            <-
0 1 0 1            <-
0 1 1 0            <-
0 1 1 1
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1

g1   1 1 1 1 0 0 0 0
g2   0 1 1 1 1 0 0 0
g3   0 0 1 1 1 1 0 0
g4   0 0 0 1 1 1 1 0
     time -->

x1 = i1 &  g1 & ~g2 & ~g3 & ~g4
x2 = i2 &  g1 &  g2 & ~g3 & ~g4
x3 = i3 &  g1 &  g2 &  g3 & ~g4
x4 = i4 &  g1 &  g2 &  g3 &  g4
x5 = i5 & ~g1 &  g2 &  g3 &  g4
x6 = i6 & ~g1 & ~g2 &  g3 &  g4
x7 = i7 & ~g1 & ~g2 & ~g3 &  g4
x8 = i8 & ~g1 & ~g2 & ~g3 & ~g4

o1 = x1 | x3 | x5 | x7
o2 = x2 | x3 | x6 | x7
o3 = x4 | x5 | x6 | x7
o4 = x8