If Gordon Rugg's method is so random then why does this happen:
http://www.georgeboolefanclub.com/wordboundarypatterns.txt
if you look at this list, unfortunately unsorted, certain patterns can be
seen to be quite consistent across word boundaries. The easiest to
see are the 'ol. .dy.' groups where a VMS word ending ol can often
be followed by the standalone pair dy. If as Rugg claims each word
is constructed from prefix midfix and suffix using a Cardan Grille then
there has to be some systemmatic ruleset involved. In which case the
patterns would give themselves away. It just cannot be random.