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"BBTU." Fullformexpand.com, https://www.fullformexpand.com/bbtu/514712. Accessed 7 Jan. 2026.
Fullformexpand.com, 2026. "BBTU." Accessed January 7, 2026. https://www.fullformexpand.com/bbtu/514712.
"BBTU." (n.d.). Fullformexpand.com. Retrieved January 7, 2026, from https://www.fullformexpand.com/bbtu/514712.
BBTU. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/bbtu/514712 (Accessed: 7 January 2026).