Before the first Egyptian pyramid was ever built, pharaohs were buried in mastabas. Mastabas are rectangular-shaped tombs with flat roofs and sloping sides. These tombs were normally made of mud bricks. Then, around 2630 BC, the pharaoh at the time, Pharaoh Djoser, decided he wanted something different. He asked his royal architect, Imhotep, to build him a tomb made of stone. Imhotep ended up building a stone structure made up of 6 mastabas, one on top of the other. Each mastaba was a bit smaller than the one below it. The result was a pyramid of mastabas. It became the first Egyptian pyramid. Pharaoh Djoser’s pyramid looks like it has a set of steps along each side. Today people call such pyramids step pyramids. By the end of its construction, Pharaoh Djoser’s tomb was 204 feet high, making it the tallest structure of its time. What is the text structure of the passage?