This file is indexed.

/etc/Crack/rules.prefix is in crack-common 5.0a-11.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# People prefixing passwords with numbers is quite a lot rarer than
# suffixing numbers.  Oh well, let's nail the buggers anyway...
!?Al^0
!?Al^1
!?Al^2
!?Al^3
!?Al^4
!?Al^5
!?Al^6
!?Al^7
!?Al^8
!?Al^9
!?Al^!
!?Al^.
!?Al^?
!?Al^ :
# trailing colon (no-op) on last line delimits space character.