This one of big telco's policy was taken as an another example of pure analytical rules about what good passwords should be look like.
See "Password rules" section on this page for complete description of policy.
Passwords from tops of Rockyou leak allowed by policy:
11112 password1 5187 princess1 4497 blink182 3998 iloveyou2 3823 babygirl1 3700 iloveyou1 2808 jordan23 2664 myspace1 2654 michael1 2398 anthony1
Visit link to see policy implementation used.