why do the Lina and Doon think tat their arrival has been expected, in the book

CITY OF EMBER

In the book "City of Ember" by Jeanne DuPrau, Lina and Doon think that their arrival has been expected because they discover a hidden room in their underground city called Ember. This room, known as the "Instructions for Egress," contains a message written by the Builders of Ember, who were responsible for creating the city.

When Lina and Doon read the instructions, they learn that the Builders constructed Ember as a temporary refuge for humanity, with the intention that its inhabitants would eventually find their way out and return to the surface. The Builders left various clues and hints throughout the city to guide future generations towards the exit.

Lina and Doon, after finding and decoding several clues, realize that their arrival was destined and that they were meant to solve the mystery of the city's escape route. They believe that the Builders anticipated their