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"OPSUM." Fullformexpand.com, https://www.fullformexpand.com/opsum/694555. Accessed 15 Jan. 2026.
Fullformexpand.com, 2026. "OPSUM." Accessed January 15, 2026. https://www.fullformexpand.com/opsum/694555.
"OPSUM." (n.d.). Fullformexpand.com. Retrieved January 15, 2026, from https://www.fullformexpand.com/opsum/694555.
OPSUM. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/opsum/694555 (Accessed: 15 January 2026).