Lesson-specific diagram for Organic nomenclature: parent chains and substituents. It visualizes the reasoning sequence tied to $\text{locants}+\text{substituents}+\text{parent}+\text{suffix}$. Text alternative: Systematic naming encodes enough structural information to reconstruct a carbon skeleton at this course level. Choose a representation that matches the chemical scale and evidence; do not infer more precision or mechanism than the data support.