In response to an order from a user, a new expendable container is supplied in exchange for an expendable container possessed by the user. A valve element is moved relative to a valve seat by a diaphragm assembly to control gas flow along the flow path. In use, an upper one of the elongated slots extends at an angle upwardly and forwardly of the second component, while the lower one of the elongated slots extends upright or upwardly and rearwardly of the second component. Terms in the approximation that correspond to future samples of the in-phase component of the signal are replaced with terms that correspond to past samples of an error that corresponds to a difference between samples of the in-phase component of the signal and an output from a detector. The quantum dot blocks converts an incident light to a light with a specific color. In addition to the foregoing, other aspects are described in the claims, drawings, and text.