A method, system, and computer-readable storage medium for automatic segmentation of a video sequence. In some embodiments, the delivered energy is biphasic, having a cycle time of not more than 500 microseconds. The machine can receive instructions in mark up language documents accessed at an HTTP address to cause operation of transaction function devices, such as a currency dispenser and a display device. Or alternatively, the solar cell structure includes a substrate, a front TCO layer, at least one first light absorbing layer, at least one interface layer, at least one second light absorbing layer, a back TCO layer, and a metal thin film layer stacked from bottom to top. The clutch further includes a second set of clutch plates fixed for rotation with a shaft adapted to transfer torque to one of the wheels of the second set of wheels.