back1	front1		cd1	book01	book06		back1-2	front1-2
back2	front2		cd2	book02	book07		back3-5	front3-5
back3	front3		cd3	book03	book08
back4	front4		cd4	book04	book09
back5	front5		cd5	book05	book10
	inside						inside1-2