"Source: Text/Incidence/AlgSym.text";
"Line: 1780";
"Date: Fri Sep 26 12:10:10 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Incidence/AlgSym.text, line: 1780
// Example: H159E24 ()
print "Example: H159E24";
ei := GetEchoInput();
SetEchoInput(true);
IsSymmetric(ElementaryToMonomialMatrix(7));
assert $1;
SetEchoInput(ei);
