Using the game logic in sir_brush you can create an 8 backwards chain lookup for 8 observations that gives you an 50% chance of getting a seed (x,y,z) that can generate a full sequence of arbitrary length. 
Full writeup: [https://mahaloz.re/tasteless-21-tasteless-shores/#rng-hacks-challenge-thrybrush](https://mahaloz.re/tasteless-21-tasteless-shores/#rng-hacks-challenge-thrybrush)