Not an expert but I think it has to do with building a model vs applying a model. Imagine you are going to build a house so you start at the ground and brick by brick you build it up and each brick you check to make sure it’s the right size and the right colour. It’s going to take a really long time. Now let’s say you already know where each brick goes and you don’t have to look for them, now instead of building the house brick by brick you can build it wall by wall and room by room.
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