Assertion: blood clot | /r/CapableOf | form in deep veins of the legs
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Source sentences:
text: Unlike deep vein thrombosis (DVT) or blood clots that form in the deep veins of the legs, the superficial clots associated with varicose veins do not usually travel to the lungs or cause a pulmonary embolism (PE) or blood clot in the lung.2 DVT/PE is a serious condition and does not usually occur with varicose veins, because varicose veins affect the veins close to the surface of the skin.3