Public bug reported:

Binary package hint: command-not-found

The function similar_words in CommandNotFound.py does not consider
numbers in command names, and therefore c-n-f fails to suggest 'bzip2'
when given the input 'bzip'.

j...@roro:~$ bzip
No command 'bzip' found, did you mean:
 Command 'bip' from package 'bip' (universe)
 Command 'jzip' from package 'jzip' (universe)
 Command 'zip' from package 'zip' (main)
 Command 'xzip' from package 'xzip' (universe)
 Command 'mzip' from package 'mtools' (main)
 Command 'wzip' from package 'wzip' (universe)
 Command 'ebzip' from package 'eb-utils' (universe)
 Command 'lzip' from package 'lzip' (universe)
 Command 'rzip' from package 'rzip' (universe)
 Command 'gzip' from package 'gzip' (main)
bzip: command not found

Adding numbers to the available 'alphabet' in the similar_words function
fixes this situation

j...@roro:~$ bzip
No command 'bzip' found, did you mean:
 Command 'jzip' from package 'jzip' (universe)
 Command 'zip' from package 'zip' (main)
 Command 'ebzip' from package 'eb-utils' (universe)
 Command 'lzip' from package 'lzip' (universe)
 Command 'wzip' from package 'wzip' (universe)
 Command 'xzip' from package 'xzip' (universe)
 Command 'mzip' from package 'mtools' (main)
 Command 'gzip' from package 'gzip' (main)
 Command 'bip' from package 'bip' (universe)
 Command 'bzip2' from package 'bzip2' (main)
 Command 'rzip' from package 'rzip' (universe)
bzip: command not found

** Affects: command-not-found (Ubuntu)
     Importance: Undecided
         Status: New

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c-n-f does not suggest commands with numbers ('bzip' does not suggest 'bzip2')
https://bugs.launchpad.net/bugs/507760
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