Lesson-specific diagram for Combustion and oxidation-reduction patterns. It visualizes the reasoning sequence tied to $\text{fuel}+\mathrm{O_2}\to\text{oxidized products}$. Text alternative: Combustion equations conserve atoms and energy while real systems may form incomplete-combustion products under limited oxygen. Choose a representation that matches the chemical scale and evidence; do not infer more precision or mechanism than the data support.