Unique Master Citizen Number Rule?

[Rolf]

You can use this approach:

Code:

...  -1 123456789 0?d0?d0?d?d7?1?d?d?d?d
...  -1 123456789 1?d0?d0?d?d7?1?d?d?d?d
...  -1 123456789 2?d0?d0?d?d7?1?d?d?d?d
...  -1 123456789 3?d0?d0?d?d7?1?d?d?d?d
...  -1 123456789 0?d1?d0?d?d7?1?d?d?d?d
...  -1 123456789 1?d1?d0?d?d7?1?d?d?d?d
...  -1 123456789 2?d1?d0?d?d7?1?d?d?d?d
...  -1 123456789 3?d1?d0?d?d7?1?d?d?d?d
...  -1 123456789 0?d0?d9?d?d7?1?d?d?d?d
...  -1 123456789 1?d0?d9?d?d7?1?d?d?d?d
...  -1 123456789 2?d0?d9?d?d7?1?d?d?d?d
...  -1 123456789 3?d0?d9?d?d7?1?d?d?d?d
...  -1 123456789 0?d1?d9?d?d7?1?d?d?d?d
...  -1 123456789 1?d1?d9?d?d7?1?d?d?d?d
...  -1 123456789 2?d1?d9?d?d7?1?d?d?d?d
...  -1 123456789 3?d1?d9?d?d7?1?d?d?d?d

It can help with the "4 custom charsets" limit, but it provides exactly the same keyspace as philsmd mentioned.
Also, to speed things up, you should have remove flag in the unmentioned section.
Well, the approach I brought up MAY actually be slower due to the internal mask generator of lite/plus - cat.