Any index that is X.Y.Z.U or X.Y.Z.U.V needs to become X.Y.A, using floatingboxes with an appropriate title, from:
Remark: for theory results,
Case Study: for real data examples that can be cited as real data examples,
Example: for simulation descriptions, or "external work/homework" problems,
Concept: for ideas that will be cited later on that are mathematical results or equations (typically).
Any index that is X.Y.Z.U or X.Y.Z.U.V needs to become X.Y.A, using floatingboxes with an appropriate title, from: Remark: for theory results, Case Study: for real data examples that can be cited as real data examples, Example: for simulation descriptions, or "external work/homework" problems, Concept: for ideas that will be cited later on that are mathematical results or equations (typically).