A set of bed sheets includes a lower sheet sized and configured to cover the bottom portion of a mattress and an upper sheet sized and configured to cover the top portion of the mattress. A liquid material delivering method wherein a liquid material is pressurized by a plunger sliding while closely contacting an inner wall surface of a liquid feed passageway establishing communication between a nozzle and a storage section to deliver the liquid material through the nozzle. An INOUT cable termination region and accessible cross-connect cable termination region are accessible from the rear of the frame. Theoretical limits on concurrency are proposed, with methods of observing them. In such circumstances there is consistency with regard to metering mesh presentation and therefore gas flow through shielding.