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"OBK." Fullformexpand.com, https://www.fullformexpand.com/obk/904921. Accessed 27 Nov. 2025.
Fullformexpand.com, 2025. "OBK." Accessed November 27, 2025. https://www.fullformexpand.com/obk/904921.
"OBK." (n.d.). Fullformexpand.com. Retrieved November 27, 2025, from https://www.fullformexpand.com/obk/904921.
OBK. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/obk/904921 (Accessed: 27 November 2025).