I have a 3 way dimmer switch that has 4 wires 1 black, 1 red, 1 green, and 1 brown. Now I am assuming that the green as we all know is the ground the black is the common and red is a traveler. Am I safe to assume that the brown wire is another traveler? My feeds are going to this dimmer switch and the 12/3 is coming from this switch to a normal 3 way and a 12/2 wire from the normal 3 way is going to the lights.