>>-+-------+--ABACKR--FDB--=--| FDB address |--,EOD=--address--->
   '-label-'                                                    

>--+-----------------------+--+-------------------+------------->
   |            .-0------. |  '-,NORMAL=--address-'   
   '-,LINECNT=--+-number-+-'                          

>--+------------------+----------------------------------------><
   '-,ERROR=--address-'   

FDB address

|--+-(R1)----+--------------------------------------------------|
   '-address-'