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"OPAK." Fullformexpand.com, https://www.fullformexpand.com/opak/248767. Accessed 17 Jan. 2026.
Fullformexpand.com, 2026. "OPAK." Accessed January 17, 2026. https://www.fullformexpand.com/opak/248767.
"OPAK." (n.d.). Fullformexpand.com. Retrieved January 17, 2026, from https://www.fullformexpand.com/opak/248767.
OPAK. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/opak/248767 (Accessed: 17 January 2026).