Now they either do not work or return "unknown command".
How to detect the command "leader" not exists inside this version of Acad?
(defun c:ll () (command "linetype" "load" "*" ""))
(defun c:le () (command "leader" pause pause pause "" "" "none"))
(defun c:ld () (command "leader" pause pause pause pause "F" "S" "" "" "none"))
(defun c:ldT () (command "leader" pause pause pause pause "F" "S" "" "" "none" "dtext" "j" "ml" pause "" ""))
(defun c:lt () (command "leader" pause pause pause "" "" "nONE" "dtext" "j" "ml" pause "" "" "dtext" "j" "l" ^C^C)