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comp

       'comp' <set> 'u'|'d'|'e'

This keyword is used to add all entities to the specified set (see seta) which depend on the already included entities (u, up), or to include all entities necessary to describe the already included entities (d, down).
For example the set "lines" is made from lines and should also include all dependent points:
comp lines do
Or the set "lines" should also include all surfs and bodies which depend on the lines:
comp lines up
In some cases you will need only the end-points of lines. With the option (e, edges) only end-points are included in the set.