how can I crack repeated password with brute forcing?

[chicken]

Hi.

I'm trying to crack MD5 hash made from repeated password.

P@ssw0rd become P@ssw0rdP@ssw0rd before It's hashed for example.


I tried like this

hashcat -a 3 -0 -r duplicate.rule -i '?a?a?a?a?a?a?a?a' hashfile


but it said -r option only supports -a 0.

so I tried stdin mode to use -r option but it was veeerrry slow.

Any good solution about that?