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"SPF." Fullformexpand.com, https://www.fullformexpand.com/spf/16592. Accessed 29 Nov. 2025.
Fullformexpand.com, 2025. "SPF." Accessed November 29, 2025. https://www.fullformexpand.com/spf/16592.
"SPF." (n.d.). Fullformexpand.com. Retrieved November 29, 2025, from https://www.fullformexpand.com/spf/16592.
SPF. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/spf/16592 (Accessed: 29 November 2025).