Assertion: lymphoma's symptom | /r/HasProperty | melena
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Source sentences:
text: These signs and symptoms may include abdominal pain, bowel obstruction, persistent nausea and vomiting, hematochezia (i.e. passage of fresh blood usually on feces through the rectum), or melena (i.e. passage of tarry feces containing blood that has been digested in the stomach or upper intestine).