0:00000000
1:000010 00

2:00000001
3:000010 01

4:2
5:000010 10

6:01 10 0000
7:000001 00


8:01 10  0110
9:000011 00

10:01 10 0000
11:000100 00

12:00000100
13:000010 01

14:00000011
15:000010 10 

16:01 10 0000
17:000111 00

18:01 10 0000
19:000101 00

20:01 10 0000
21:000110 00