I really loved your original post! I wish I would have had an instruction manual like this many years ago! I paid $35.00 for a Finnish-English dictionary but it did not have such useful information!
You have jailbroken the Secret Proprietary Encrypted Language of Finnish!

Could you please write a list of all Suomi prepositions?
Do they
all literally just copy onto the end of
every word?
Or does it sort of depend on the last letter of the word?
You did not explain how to convert a singular word into plural?
As in:
I have house.
I have 2 houses.