E.4.DPF:5.1 - Pattern-address and reorder slice

A Systems Engineering DPF edition gives SYSE.22 a stable address and places it after SYSE.2 because that order helps its readers. A later edition may move SYSE.22 without renaming it when its recurring problem and working answer continue; the ToC and body order change together, while old citations still resolve through the same PatternID. If a later repair splits that working answer, only the continuing answer keeps SYSE.22; the other answer receives a new unused PatternID, and readers of the old reference get a short migration assertion or an explicit stop.