Leading an expedition through an abandoned mining valley, Emek and Tara followed numbered trail markers left by earlier explorers. Their guidebook explained that genuine markers shared specific divisibility properties and common factors, while misleading markers did not. The numbered stones included values such as 168, 180, 187, 216, and 245. At each fork, they tested divisibility, identified common factors between key markers, and compared the resulting number patterns before choosing a direction. Their careful reasoning filtered out the false trails, and just before nightfall they reached the hidden supply cache, ensuring the expedition could continue safely the next day.