How do I - Additional Combo Cycle

Hey guys wanted your ideas on something I've struggled with -

I have a character that needs a cycle of moves to make up a combo. It will start at one repetitive move, then add a random one to the end of the combo chain every so often. So it may start with punch, randomly add punch/kick/shoot and remember the order of the chain each time. You will start at one move combo, then 2, 3, 4 and so on. Hopefully I have portrayed the idea correctly. Any tutorials or ideas on how to approach this?

I doubt that there are any tutorials on this.

If you want to "remember" the order of the chain with pseudo-randomized variations, there are many way to do this. All of them involve some kind of temporary storage (arrays, dictionaries, etc.).