If ``b'' is entered for a subtree at #22 above, an option is presented to first run the network forward from the seed state by a specified number of steps before running backwards. The new seed is the state reached on the forward run, and becomes the root of the subtree. Running forwards before running backwards is usually necessary because a seed selected at random is very likely to be a garden-of-Eden state; a state with no pre-images thus no subtree.
forwards before backwards?
how many steps (default 0, max 90): (the max number of steps depends on the context)
Enter the number of forward steps, or accept the default 0.