Place sausage in a skillet over medium heat, and cook until evenly brown. Drain grease, and transfer sausage to a slow cooker.
Into the slow cooker with the sausage, mix wax beans, green beans, lima beans, and black beans. Mix in baked beans with liquid and chili beans with liquid. Stir in the tomato paste, brown sugar, barbeque sauce, green bell pepper, onion, and fennel seed.
Cover slow cooker. Cook on Low at least 5 hours.
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