 Once having constructed the set \(I\) it is possible to define time intervals and these, in turn, can be used to measure the temporal extent of an event. In Example 1, for example, \(a\) goes on in the interval [\(i_1], b\) in [\(i_1, i_2], c\) in [\(i_2], d\) in [\(i_2, i_3\)] and \(e\) in [\(i_3\)]. Corollary 1 guarantees that these intervals can be constructed (Kamp 1979: 379). 