1. Antioxidant activity of ten grades of Indonesia black tea (Camellia sinensis (L.) O. Kuntze) liquor 2. Antioxidant activity, phenol total, and flavonoid total of green tea (Camellia sinensis (L.) O. Kuntze) from three West Java tea estate 3. Suppply chain analysis of Indonesia tea 4. Strategic formulation to increase white tea competitiveness (Case study: Research Institute for Tea and Ci…