Adding an SSN DDI Narrow Keyword to an existing SSN policy.
Copy and paste the narrow DDI keyword definitions from the help text into the SSN rule for one of your existing SSN policies.
If you want to catch more possible combinations, shift to the Medium Breadth (to catch valid #s with "."s as separators). Select the "find Keyword" checkbox and add whatever you want (note that this will override the existing list, so you have to include everything that you want)