My question is a bit familiar to How can I randomly power one of several wires in Minecraft?, but slightly different.
Let's say I have 5 wires (or more), wire A, B, C, D and E. Now, I want to randomly pulse one of them with the hit of a button. However, there should be a greater chance to pulse wire A and B, then the chance to pulse C and D. Also, the chance to pulse E should be smaller then A, B, C and D.
How can I achieve this?