"Source: Text/LieTheory/Cartan.text";
"Line: 976";
"Date: Fri Sep 26 12:10:11 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/LieTheory/Cartan.text, line: 976
// Example: H105E13 ()
print "Example: H105E13";
ei := GetEchoInput();
SetEchoInput(true);
for n in [1..5] do
    IsTree(IrreducibleCoxeterGraph("A~", n));
end for;
C := &join[ IrreducibleCoxeterGraph(t, 4) : t in ["A","B","C","D","F"] ];
SetEchoInput(ei);
