- - Thorns
- - backbones of books or people
- - Where titles can be read
- - Cacti components
- - Quills on a cactus
- - Sharp projections
- - Books' backs
- - Backbones of books
- - Cactus features
- - Backbones
- - Bookshelf display
- - Sets of vertebrae
- - Things seen on a bookshelf
- - Features of hedgehogs
- - Places for book titles
- - Ridges made of wood seen aboard ship
- - Quills
- - Library patrons read them
- - Book backs
- - Title holders?
- - Porcupine quills
- - Title locations
- - Bookbinder's pieces
- - Spots for authors' surnames
- - They're seen on bookshelves
- - Bookcase lineup
- - Places to find literary titles
- - Mollusks lack these
- - Parts of books
- - Bookshelf lineup
- - They've got your back
- - Sea urchin's protection
- - Book parts
- - Backs of books
- - Procupine's protection
- - Novels have them
- - Vertebral columns
- - Echidna features
- - Places for titles
- - Sea-urchin features
- - Porcupine's protection
- - Tomes' strongest parts
- - Book stiffeners
- - Sharp plant parts
- - Thistle features.
- - Porcupine's weapons.
- - Cactus bristles.
- - Defense of the porcupine.
- - Prickles.
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