Ooh, you've seen 3? Thanks for playing through it multiple times!
There are a total of 8 forms (and a 9th just in case of errors, but it's nothing special). You can check them yourself if you're curious enough, the files should be visible and unarchived. Open the game's folder -> game -> images; They're named "111", "112", "121" and so on until "222" with "0" being the Error image. It should be the first 9 images if sorted in alphabetical order. The numbered filenames made it easier for me to calculate certain stuff.