... subsections. Once I recall what "group" I'm looking at, then ... B|/A_
**Group 2: Valid Arguments 3 to 5** – ... relationship**: #3 **A→B→C**, #4 **A←s→B→C**, #5 ... that #3 is _A→C_, #4 is _A←s→C_, and ... ‑m→C_.
**Group 3: Valid Arguments 6 to ...