Placeholder demonstration tilesets meant for showing and helping tileset makers this way to implement multiple raise values using a single terrain entry.
This was something I got in my belly for quiet a few years, and its just because I read some ancient writings from Lucifer Church and Thallionstellani, that I finally got the insight on how to accomplish this, so kudos to them!!
Note: read the documentation file, and be aware that you need to manually edit the .set file OR use MDA's Set Editor (he gently updated his editor to allow negative values, a big thank you Michael!!)