How to sort two lists? Sort distance

[StephenG1CMZ]

I found an old thread relevant to sorting (I missed it before): http://www.hpmuseum.org/forum/thread-429...light=SORT
"Best way to sort one list based on another".

But the latest suggestion using SORT's undocumented second parameter isn't compiling:

Code:



 EXPORT BSORT()
 BEGIN
  L1:={
   {3,"H", "Hydrogen"},
   {2,"He","Helium"}};
  SORT(L1);//SYNTAX OK-UNSORTED
  L2:=SORT(L1,{2}); //SYNTAX?
 
 END;