N ^ Index /|\ ------- | D: door | u: stairs going up s: stairs going down
_______________ | | | | | |_ D|_ D| |_____ DD D_ D| | D | |s|u| |_______| DD | | _D |_____| |____ D_| D | | D _D |___ D| | D_|D |_| |_______|_____D_|