example2.bb

clear X;
incr X;
incr X;
clear Y;
incr Y;
incr Y;
incr Y;
clear Z;
while X not 0 do;
   clear W;
   while Y not 0 do;
      incr Z;
      incr W;
      decr Y;
   end;
   while W not 0 do;
      incr Y;
      decr W;
   end;
   decr X;
end;

debug X;
debug Y;
debug Z;