Three merchants – Sosipatra Titovna, Olimpiada Karpovna, and Polyxena Uvarovna – sat down to drink tea. Olimpiada Karpovna and Sosipatra Titovna drank 11 cups together, Polyxena Uvarovna and Olimpiada Karpovna consumed 15 cups, while Sosipatra Titovna and Polyxena Uvarovna had 14 cups. How many cups of tea did all three merchants drink together?
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