S
PL_
PL_
PL_EXECUTE{%}CAPTURING{%}RETURNING{%}
*
      EXECUTE {%1} CAPTURING T1$$$ RETURNING T2$$$
      LOOP WHILE T1$$$ # '' AND T1$$$<1> = '' DO
         T1$$$ = DELETE(T1$$$,1,0,0)
      REPEAT
      {%2} = T1$$$
      LOOP WHILE T2$$$ # '' AND T2$$$<1> = '' DO
         T2$$$ = DELETE(T2$$$,1,0,0)
      REPEAT
      {%3} = T2$$$
