Advice on how to modify for more specific rules?

[kittyray]

Hi! I've been playing around with this for a project and it's great so far, but I'm trying to modify it so that it can allow for rules like Tile 0 is allowed to the left of Tile 1 if and only if Tile 0 is also to the right of Tile 2 or Tile 4 is only allowed on edges . I am looking through the code to see if I can figure this out myself, but if you happen to see this, any tips would be appreciated.

Thank you!