a) The "Entry tree" and the "Posting trees" of the graphic "gin.svg"
shows links not only from one tree-level to the next but also within
each level from node to node. Is that correct?
b) Is it worth to visualize PG's tree-implementation in a separate
graphic - or is it the same as in every other tree-implementation that
you have learned in your academic studies? If yes: in which chapter?
Kind regards, Jürgen
