Please answer the following question: Information:  - William Tell (in the four languages of Switzerland:  ) is a folk hero of Switzerland. His legend is recorded in a late 15th-century Swiss illustrated chronicle. It is set in the time of the original foundation of the Old Swiss Confederacy in the early 14th century. According to the legend, Tellan expert marksman with the crossbowassassinated Gessler, a tyrannical reeve of Habsburg Austria positioned in Altdorf, Uri.  - A codex (from the Latin "caudex" for "trunk of a tree" or "block of wood", "book"; plural "codices") is a book constructed of a number of sheets of paper, vellum, papyrus, or similar materials, with hand-written contents. The book is usually bound by stacking the pages and fixing one edge, and using a cover thicker than the sheets. Some codices are continuously folded like a concertina. The alternative to paged codex format for a long document is the continuous scroll. Examples of folded codices include the Maya codices. Sometimes people use the term for a book-style format, including modern printed books but excluding folded books.  - A crossbow, also known as horizontal bow, is a type of weapon based on the bow and consisting of a horizontal bow-like assembly mounted on a stock. It shoots projectiles called bolts or quarrels. The medieval crossbow was called by many names, most of which were derived from the word ballista, a torsion siege engine resembling a crossbow.  - A manuscript (abbreviated MS for singular and MSS for plural) is any document written by hand or typewritten, as opposed to being mechanically printed or reproduced in some automated way. More recently, it is understood to be an author's written, typed, or word-processed copy of a work, as distinguished from the print of the same. Before the arrival of printing, all documents and books were manuscripts. Manuscripts are not defined by their contents, which may combine writing with mathematical calculations, maps, explanatory figures or illustrations. Manuscripts may be in book form, scrolls or in codex format. Illuminated manuscripts are enriched with pictures, border decorations, elaborately embossed initial letters or full-page illustrations.  - The White Book of Sarnen ( German : Weisses Buch von Sarnen ) is a collection of medieval manuscripts compiled in the late 15th century by Hans Schriber in the canton of Obwalden . This volume , 258 pages in length , was given its name because of the white parchment in which it is bound . The White Book of Sarnen contains the earliest surviving reference to the Swiss national hero William Tell .    What object entity has the relation of 'material used' with the subject 'white book of sarnen'?   Choices: - bow  - paper
A:
paper