If ``r'' is selected at #15.1, a seed, or a segment only, can be set at random. The following prompt is displayed, depending on weather the network is 1d or 2d:
central segment only enter size (default 20), all-a (example for a 1d network, n=100)
central 2d block only enter diameter (default 7), all-a: (example for a 2d network 36 36)
The default segment size is 1/5 of the 1d network size, and 1/5 of the 2d network width, i. Enter ``a`` for a random bit pattern across the whole network. A seed is selected at random and displayed in decimal (for n<=32), in hex (for n<=256), and as the rule table bit pattern (in 1d or 2d). The seed can be accepted or an alternative random seed may be generated.
The seed can be rotated as in #15.3. To accept the seed bit pattern, enter ``return``. During the random setting procedure the following prompt is displayed, depending on whether the network is 1d or 2d.
(rotate-l/r, another-n, backtrack-q, accept-ret) (for 1d, ``rotate-l/r/u/d`` for 2d)
Enter ``n'' for another random rule, ``l``, ``r``, ``u'' or ``d'' to rotate.