seti

   'seti' <set> 'n'|'e'|'p'|'l'|'c'|'s'|'b'|'S'|'L'|'se'|'sh' ->
          <set> <set>..

This keyword is used to generate an intersection of certain sets (what do the specified sets have in common of the specified entity-type?). Example:

seti intersectSet p set1 set2 set3

generates a set intersectSet with points which are stored in each of the sets set1 set2 set3.