Because every stop has a fixed place in the order, a journey can answer "What is at stop 12?" or "What came before the rope?"
Worked example: Worked example
Walk: gate (rope), porch (lamp), door (drum), hall (kite), kitchen (bell), garden (boat). What came just before the bell?
- The bell is at the kitchen, stop 5.
- Stop 4 is the hall, which holds the kite.
Answer: The kite.
Key idea
Count stops in a fixed direction. Every fifth stop is a landmark that keeps the count honest.