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veins carry blood back to the heart
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veins carry blood back to the heart, do veins carry blood back to the heart, all veins carry blood back to the heart, do veins always carry blood back to the heart, veins always carry blood back to the heart, veins that carry blood to the heart, veins bring blood to the heart, veins take blood to the heart, veins that return blood to heart, major veins returning blood to the heart
