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"GUM." Fullformexpand.com, https://www.fullformexpand.com/gum/387249. Accessed 29 Nov. 2025.
Fullformexpand.com, 2025. "GUM." Accessed November 29, 2025. https://www.fullformexpand.com/gum/387249.
"GUM." (n.d.). Fullformexpand.com. Retrieved November 29, 2025, from https://www.fullformexpand.com/gum/387249.
GUM. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/gum/387249 (Accessed: 29 November 2025).