gap> S := SingularBrauerMonoid(5);;
gap> Size(S);
825
gap> NambooripadPartialOrder(S);;time;
Error, Record Element: '<rec>.lambda_orb' must have an assigned\
 value in
  o := data!.lambda_orb
 ; at /Users/tianrun/Library/Preferences/GAP/pkg/semigro\
ups/gap/main/acting.gi:650 called from
Position( data, x
 ) at /Users/tianrun/Library/Preferences/GAP/pkg/semigro\
ups/gap/attributes/acting.gi:40 called from
IsGreensDGreaterThanFunc( S )( y, x
 ) at /Users/tianrun/Library/Preferences/GAP/pkg/semigro\
ups/gap/attributes/attr.gi:1021 called from
StableSortParallel( list, index, comp
 ); at /Users/tianrun/Documents/gap-4.13.1/lib/list.gi:2\
461 called from
Sortex( elts, function ( x, y )
      return IsGreensDGreaterThanFunc( S )( y, x );
  end
 ) at /Users/tianrun/Library/Preferences/GAP/pkg/semigro\
ups/gap/attributes/attr.gi:1021 called from
<function "NambooripadPartialOrder for a semigroup">( <a\
rguments> )
 called from read-eval loop at *stdin*:34
type 'quit;' to quit to outer loop