"Source: Text/Aggregates/Set.text";
"Line: 978";
"Date: Thu Sep 25 14:47:47 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Aggregates/Set.text, line: 978
// Example: H10E7 ()
print "Example: H10E7";
ei := GetEchoInput();
SetEchoInput(true);
B := {@ { i : i in [1..k] } :  k in [1..5] @};
B;
#B;
Universe(B);
Parent(B);
Category(B);
Index(B, { 2, 1});
#B[2];
Universe(B[2]);
SetEchoInput(ei);
