You mean:
0
1
2
3
4
5
6
7
10?
Don't know anything about it.
Ummm... your glasses... Do they have a line running across the sort of lower part of each lens? And you need to be wearing your glasses to find... your glasses?
000
001
010
011
100
101
110
111
1000
Flipping switches and counting BCD or Octal as required for the moment.
An innocent child (like me) doesn't just pick that up.... ;)
/johnny