construction.

	Source		Result

+	closed wood door	+	closed wood door with peephole
+	closed metal door	+	closed metal door with peephole
		O	open safe
.	empty metal door frame	+	closed bar door
"	window	#	window with metal bars
"	window without curtains	#	window with metal bars
"	window	#	window with metal bars
.	concrete	T	large metal support
.	concrete	l	small metal support
		g	hanging meathook
	is:FLAT	&	radio tower
	is:FLAT	6	radio controls
		T	exercise machine
		5	mechanical ergometer
		L	gravity treadmill
{	refrigerator	{	vehicle refrigerator
{	vehicle refrigerator	{	vehicle freezer