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Which sentence is the Main Idea of the following paragraph?
The writing process consists of four main stages. The first stage, called the gathering stage, consists of researching, brainstorming, and analyzing in order to come up with a thesis. The next stage, organization, requires you to think about a logical and persuasive arrangement for your various ideas. The writing stage requires you to sit down and, following and outline, construct your essay. The fourth and final stage involves endless revision: going over and over what you've written to make it better.
What is sentence #1?