| http://www.w3.org/ns/prov#value | - The first blade 16 a may rotate between a first, closed position, illustrated in FIG. 5, in which the blade 16 a is oriented approximately perpendicular to a plane defined by the bottom surface 28 a of the blade assembly 12 a, and a second, fully expanded position in which the blade 16 a is oriented at an angle other than perpendicular to plane defined by the bottom surface 28 a of the blade assem
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