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The rocking chairs and the regular chairs in the Media Center are both alike and different. They are alike because they are made from the same wood, and have the same cloth pads. They are different because on the rocking chairs, the back legs have a divot out of them so you can rock back and forth while sitting in them, while the other chairs have normal legs.
What is the author's purpose and text structure?
Author's purpose: To inform
Text structure: Compare/Contrast