I removed the keys on my filco majestouch 2 today and cleaned it. I assumed that all square keys where the same size/shape, so mixed all the keys together. Furthermore I use blank keys. Now that I try to put them back I notice that they are all shaped slightly different, and I don't know which keys go where. I sorted all square keys into four categories: flat, slight backward tilt, backward tilt, slight forward tilt. Are there only four types of keys or are there differences I missed? Anyone know which group of keys is supposed to sit on which row?