correct horse battery staple - every word variation

[lukasz]

Hello all



I'm trying to create a dictionary/rule thing for a password with 4 words.


xkcd example:
correct horse battery staple
correcthorsebatterystaple
c0rrect h0rse b@ttery staple
correct1horse2battery3staple4

and so on.

What would be the best way to achieve that?

TIA