INTERLUDE: we are half-way through the trail

We've now covered most of the diagrams in the SysML Hybrid SUV sample problem from Annex D of the SysML-1.6 specification. But those aren't the only diagrams in the specification.

The specification also includes many diagrams in the main body of the document, some of which also reference the Hybrid SUV sample problem. We shall now work through most of these other diagrams (and not just Hybrid SUV sample problem ones).