| http://www.w3.org/ns/prov#value | - The combination pen and marker 206 may further include a tool 207 adapted to aid in the removal and replacement of the three-dimensional models 108A, 108B, 108C. The three dimensional models 108A, 108B, 108C may be made of a relatively inexpensive material, e.g. plastic, rubber, etc., to allow the user of the clipboard 100 to give away the models.
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