only the front half of an human rib cage. Include only sternum and the anterior parts of the ribs. Generate clean, distinct pieces: the sternum as one object and each rib as separate mesh elements. No spine, no scapulae, no organs, no back ribs. Clean topology, medium-poly, smooth curves, anatomically plausible proportions but not hyper-detailed. Meshes must not be fused: sternum separated, ribs separated. Straightforward geometry suitable for editing and remeshing in Blender. No thickness exaggeration. Output as a single model composed of multiple distinct meshes