rarchical sets of stars may create
different physical conditions at a variety of levels (e.g. of stellar density)
that induce special types of stars, or of stellar behavior, at those levels;
Etc.

<P><U>Possible or actual properties, dimensions, or features of hierarchies
or of their contents include</U>: Elements; Sets, subsets, and supersets;
Levels; Degrees; Layers; Ranges; Intervals; Gaps; Folia; Partitions; Stages;
Chains or sequences; Series; Harmonics or powers; Units and multiples;
Domination and su