d(0)=character
d(1)=line of characters
d(2)=page of text
d(3)=book
d(4)=shelf of books
d(5)=bookcase
d(6)=row of bookcases
d(7)=room of bookcases
d(8)=library building
d(9)=street of libraries
d(10)=city block of libraries
d(11)=row of city blocks of libraries
d(12)=city of libraries
d(13)=continental coast of library cities
d(14)=library continent
d(15)=planet of libraries
d(16)=library starsystem
d(17)=library constellation