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"HEHC." Fullformexpand.com, https://www.fullformexpand.com/hehc/high-efficiency-hybrid-cycle. Accessed 20 Feb. 2026.
Fullformexpand.com, 2026. "HEHC." Accessed February 20, 2026. https://www.fullformexpand.com/hehc/high-efficiency-hybrid-cycle.
"HEHC." (n.d.). Fullformexpand.com. Retrieved February 20, 2026, from https://www.fullformexpand.com/hehc/high-efficiency-hybrid-cycle.
HEHC. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/hehc/high-efficiency-hybrid-cycle (Accessed: 20 February 2026).