According to one embodiment, a first engaging surface can be configured to engage a first region of an antler set, and a second engaging surface can be configured to engage a second region of the antler set. An aryl ether oligomer may be made from a dihydroxyaromatic compound and a dihaloaromatic compound in the presence of a base. The computer applies an algorithm, such as, Loop’s Equation, to the data points to create new data points defining new vertices that subdivide the triangles into smaller triangles. The optical transmitter and the optical receiver are so positioned that light from the transmitter cannot directly reach the receiver. A gate extends over a surface portion of the body region. In some embodiments, the motors comprise a stationary member having a base and a stator, a rotating assembly having a magnet and a magnetic force attenuator to attenuate the magnetic attraction force between the magnet and the base; and a fluid bearing to support rotation of the rotating assembly relative to the stationary member.