Apparatus for depositing sheets on a stack, which permits essentially free access to the stack and can be implemented with a low outlay of materials and costs. The first flip-flop of the plurality of flip-flops latches a first input signal in synchronization with a clock signal, outputs a first output signal and fixes the first output signal based on the first selection control signal. At airplane mode, the rotorscissors wing and scissors wing form a scissors wings configuration to maximize the air vehicle’s flying efficiency at a wide range of speed and flying conditions by adjusting the yaw angle of the rotorscissors wing and scissors wing. The part of the boundary region overlapping the light-shield layer is a region permitting liquid crystal molecules surrounding the region to tilt so that the ends of the liquid crystal molecules closer to the substrate having the light-shield layer go away from the region upon application of a voltage. The implant of the present invention may work in conjunction with either the patient’s existing phalanx or one-piece phalanx implants designed andor manufactured independently from the metatarsal implant.