Bob and his family moved to a new city. “Let’s explore the new place," his father said. They came to a square where one street went left, the other street went right. Which way should they take? Bob and his father said the left one. Her mother and sister said the right one. So it happened that Bob went left with his father, and mother with his sister went right. They all just followed the streets. After one hour of walking they all met again. Both streets ended in the same square.