A method and a system is described to predict effects of coupling on timing by estimating the delta delay and delta slack that can occur due to coupling on any net, for optimization to minimize the sensitivity of slack to potential coupling violations. The water level switch and its holder are placed, without the need for fixation devices, into a birdbath, thus allowing for existing birdbaths to be easily converted into automatically filling birdbaths. The system can monitor the medical item inventory in real time to automatically determine a low supply of a particular medical item type. A wordline extends over the conductive region, and a contact couples the wordline to the conductive region so as to couple the wordline to the lower plates of the respective capacitors. The outer bristles are cut at lengths shorter than the inner bristle length, and at an angle to the rotational axis.