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They should be OK. But in general, yellow peppers are high in sugar, so you may need to ration how much of them you feed.
Red or green leaf lettuce. Romaine, while no higher in calcium than the other lettuces, can cause excess urinary calcium in some pigs. Not in all, so there's something about the make-up of the pig that makes it happen, but I wouldn't want to run the risk. You can give small amounts of kale or spinach, but those aren't the main staples.