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1
Bring a large pot of lightly salted water to a boil over high heat. Add the angel hair pasta, and cook until al dente, 3 to 4 minutes; drain and keep warm.
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2
Heat the olive oil in a large skillet over medium-high heat. Add the sausage slices, and cook until lightly browned on both sides, about 2 minutes per side. Reduce the heat to medium, and stir in 2 tablespoons of butter along with the onion, garlic, bell pepper, stir-fry vegetables, salt, and pepper. Cook and stir until the sausage is no longer pink in the center, and the vegetables have softened, 10-12 minutes.
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3
Meanwhile, place the clams, mussels, and shrimp in a steamer over 1 inch of boiling water, and cover. Remove the shrimp once they turn pink, after about 3 minutes. Remove the clams and mussels as soon as they open, after 3 to 5 minutes all together. Discard any clams and mussels that do not open. Set the seafood aside and keep warm.
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4
Place the scallops into the skillet with the vegetable mixture, and gently cook until the scallops are no longer opaque in the center, about 3 minutes. Gently stir in the steamed seafood, parsley, and remaining 2 tablespoons of butter. Serve the seafood and vegetable mixture over a bed of angel hair pasta.