[jitter] Anyway to random select cut up matrices from jit.scissors?

Hello. Need some help on this. 

I have four jit.scissors objects (each cutting a qt movie into 12 pieces)and need to recompose them with one jit.glue object. So I need to randomly select one segment matrix from four matrices each generated from the four qt movies at the same position to plug into the matching position in jit.glue. 

Any idea? Thanks!