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"OPA." Fullformexpand.com, https://www.fullformexpand.com/opa/445944. Accessed 26 Nov. 2025.
Fullformexpand.com, 2025. "OPA." Accessed November 26, 2025. https://www.fullformexpand.com/opa/445944.
"OPA." (n.d.). Fullformexpand.com. Retrieved November 26, 2025, from https://www.fullformexpand.com/opa/445944.
OPA. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/opa/445944 (Accessed: 26 November 2025).