A Service Cycle can include a set of Service Types which fall into a specified pattern. For example, the Service Cycle of 'Tachograph' can include three Service Types:
By locating these Service Types within the Cycle in the above order they are defined as being related to each other in a pattern of 1,2,3,1,2,3,etc.
Other Services that apply to the vehicle, but independently of the Tachograph events, could be located in other Service Cycles.