7 bits, 2 taps: 2
7 6
7 4

7 bits, 4 taps: 5
7 6 5 4
7 6 5 2
7 6 4 2
7 6 4 1
7 5 4 3

7 bits, 6 taps: 2
7 6 5 4 3 2
7 6 5 4 2 1