A computer graphics apparatus includes a walk-through function to simulate with a computer the concept of walking through a structure such as a building. The cutting tool insert is characterized by a cemented carbide substrate and a coating comprising an about 0. The shear-off torque of the predetermined weakenings on the portions without the stepped predetermined weakening increases continuously in the direction of the head portion, and a force transmission element is insertable into the internal recess of the shearable fastener. Since the guide plate slides and is in contact with the brushes containing the detergent, the guide plate is always maintained in a clean condition. Inbred maize varieties derived from inbred maize variety PH1T9, methods for producing other inbred maize varieties derived from inbred maize variety PH1T9 and the inbred maize varieties and their parts derived by the use of those methods. The light source radiates near-infrared light through the portion of the finger to be imaged.