4/k.. rand seed/block reseed the network with a random seed or random block (see #15.5).
R.. rand bitflip mutate the current network by 1 random bit.
5/6.. singleton pos/neg reseed the network with a central 1 surrounded by 0s, or visa versa.
i/d.. inc/decrease 1 cell increase or decrease the network size by one cell (not for a 3d network)