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"U40." (n.d.). Fullformexpand.com. Retrieved April 18, 2026, from https://www.fullformexpand.com/u40/phentermine-hydrochloride-pill-imprint.
U40. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/u40/phentermine-hydrochloride-pill-imprint (Accessed: 18 April 2026).