The invention relates to a fixing element for fixing a component to a support part. For example, a method of aggregation in an application that involves an uncertain data set includes the following steps. An edge layer that manages devices, receives collection requirements from the backend layer, configures and instructs devices for data collection, and conducts aggregation and primitive processing of the data. Power for triggering may come from a storage source rather than line power to reduce emissions on the power line. Each of the cover pieces includes an outer elliptical cover skin and an inner elliptical construction liner which is overlappedly attached on an inside of the cover skin for supporting the cover skin and enclosing the inflatable bladder. Players are permitted in various embodiments to wager on the various outcomes with betting options such as a second chance wager, an enhanced wager, a combination wager, sequenced or non-sequenced, or the like.