Prescribed evolution

The final option concerns specifying two lines in the line editor's array, then searching for a rule which will lead from the first line to the second. Again, certain transitions may be forced by previously inserting them in the rule table and marking them.

When a rule complying with the requirements is found, the program pauses, awaiting a decision to accept the result, or to continue searching for another, if any. If, at any stage, no rule can be found, the program announces this fact when it pauses.

Harold V. McIntosh