A random number generating unit generates a random number t. The indicator includes at least one alignment mark formed at a gate pad unit and a data pad unit of a liquid crystal display panel, and at least one pattern for detecting a grinding amount between a first end portion of the gate pad unit and the alignment mark, and a second end portion of the data pad unit and the alignment mark. The system frame includes a plurality of tubes. The steer assembly comprises a leg assembly including a pair of leg members being pivotable with respect to the ground surface and an actuation mechanism for pivoting the leg members when the support assembly is moved across the ground surface. As described above, a degraded image can include an image that has had a portion obscured by shadows or debris. An apparatus includes an elongated support member; a primary transmitter on the elongated support member; and a receiver toroid on the elongated support member, the receiver toroid being positioned transversely on the elongated support member and including a single coil antenna.