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"PTN." Fullformexpand.com, https://www.fullformexpand.com/ptn/713972. Accessed 6 Jan. 2026.
Fullformexpand.com, 2026. "PTN." Accessed January 6, 2026. https://www.fullformexpand.com/ptn/713972.
"PTN." (n.d.). Fullformexpand.com. Retrieved January 6, 2026, from https://www.fullformexpand.com/ptn/713972.
PTN. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/ptn/713972 (Accessed: 6 January 2026).