The locations (referred to in problem #6) are numbered and the sequence number of a location is called its

It seems your question is incomplete and lacks specific context. Based on existing concepts, I can infer that you might be referring to a sequence in a mathematical or logistical context, where each location has a designated identifier or label, often referred to as a "sequence number" or "index."

In various fields, a sequence number is used to uniquely identify the order of items, locations, or data points. For instance, in programming, an index might refer to the position of an element in a list or array. In mathematics, it could relate to the position of a term within a sequence or series.

If this is a specific question related to a problem you are encountering, could you please provide more information or clarify the context so I can assist you further?