This invention relates to interior rearview mirror assemblies for vehicles and to interior rearview mirror assemblies without a frame or bezel having inputs corresponding to elements representing a symbol. First and second microphone elements are selected each having a diameter \u201cd\u201d and a thickness \u201ct\u201d. An establishing response and the upstream and downstream labels are sent from the terminal node to the foregoing nodes node-by-node, and each of other nodes except the first node chooses an upstream label and a downstream label to an upstream node according to the upstream and downstream labels provided by the downstream node. However, the closing roof part is displaced relative to the main roof part and opens the cutout in the storage position. Partially reacted liquid scrubbing reagent and scrubbing byproducts can therefore be withdrawn for treatment before the addition of fresh reagent alters the pH of the treatment stream.