In the following code how do you get back the name of the key?

o = CREATEOBJECT("collection")

o.Add("Ford F150", "Truck")
o.Add("Chevy Impala", "Car")
o.Add("747", "Airplane")
o.Add("Titanic", "Boat")

** oitem is the name of the vehicle
FOR i = 1 TO o.Count
	oitem = o.Item(i)
ENDFOR

** same here
FOR EACH x IN o
ENDFOR

I want to get back "Truck", "Car", "Airplane" or "Boat"