... rather than just recalling all 9 forms, I find it much ... blindly trying to memorize all 9 of them. Seeing a grouping ... 3: Valid Arguments 6 to 9** – deals with **A** being the ... **A→B & A→C**, #7 **A→B & A←s ... →B & A‑m→C**, #9 **A‑m→B & A ...