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"OPPAL." Fullformexpand.com, https://www.fullformexpand.com/oppal/446272. Accessed 27 Nov. 2025.
Fullformexpand.com, 2025. "OPPAL." Accessed November 27, 2025. https://www.fullformexpand.com/oppal/446272.
"OPPAL." (n.d.). Fullformexpand.com. Retrieved November 27, 2025, from https://www.fullformexpand.com/oppal/446272.
OPPAL. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/oppal/446272 (Accessed: 27 November 2025).