We are representing physical Containers by delimiting boundaries and basic facts by empty containers.
Do both intervals become empty at the same time?
The second issue is can the Traversal reach a point in which at least one of the intervals is empty?
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The term “process” describes a temporally irreversible sequence of events [⇒ Event (Ereignis)].
See: One Hundred Steps. The idea is to list one hundred curious things about programming. These can be taken on faith. In some languages they are true. In other languages, no. Developing a sense of what might and might not be true is the part of programming that is rarely taught, probably because the inconsistency is an embarrassment.