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"PTN." Fullformexpand.com, https://www.fullformexpand.com/ptn/713972. Accessed 17 Nov. 2025.
Fullformexpand.com, 2025. "PTN." Accessed November 17, 2025. https://www.fullformexpand.com/ptn/713972.
"PTN." (n.d.). Fullformexpand.com. Retrieved November 17, 2025, from https://www.fullformexpand.com/ptn/713972.
PTN. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/ptn/713972 (Accessed: 17 November 2025).