Where to look: at 26 R. Yose’s challenge arrives open over four earlier challenges, each with its answers folded and Rav Pappa’s and Sumchos’ frames intact. Click the Sumchos band (7 sentences folded · between …) and a second rail appears one lane inside the mishnah’s — the only way a nested rail ever does. Open Rav Pappa’s band too and attention moves there: its rail takes the inner lane and Sumchos’, no longer enclosing it, drops out.