A system and method for dynamical decoupling of a quantum system includes forming a graph including elements to account for decoupling sequence effects represented as nodes in the graph and soft pulses applied being represented as edges in the graph. First lens region 10 includes a plurality of first projections 172. Authorization is transmitted to the payee to request debits from the payor. Both sets of belts pass through a movable carriage that guides the receiving belts from the upper elevation to the lower elevation and the discharge belts from the lower elevation to the upper elevation so that the receiving belts are at a higher elevation on the receiving end of the carriage and the discharge belts are at a higher elevation on the discharge end of the carriage. In the preferred embodiment, the back and underside of the unit is hollow to incorporate a filter media, pump, heater, additional aeration device or any other such desired apparatus. According to another aspect of the invention, multiple wind engines are stacked.