Unlike the implementation guide, the transaction set definition cannot specific which values are allowed at the element-level. This means different instances of the same loop (or segment) cannot be distinguished, so they're just described as one thing.

In this case you have several `HL` loops at offset 50 which should be collapsed into a "super set". So if the first `HL` loop in the implementation guide has segments `A` and `B`, and the second `HL` loop has segments `B` and `D`, then the transaction set definition should have a single `HL` loop with segments `A`, `B`, and `C`.