Long description: tree
Alt text: A tree diagram illustrating the hierarchical classification of materials, branching from 'auto' and 'manual' to various subcategories.
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- The diagram shows a top-level branching structure originating from 'auto' and 'manual'.
- The branch labeled 'auto' further divides into 'sun roof' and 'air cond'.
- The 'sun roof' branch divides into 'steel' and 'alloy'.
- The 'air cond' branch under 'auto' divides into 'steel' and 'alloy'.
- The branch labeled 'manual' further divides into 'sun roof' and 'air cond'.
- The 'sun roof' branch under 'manual' divides into 'steel' and 'alloy'.
- The 'air cond' branch under 'manual' divides into 'steel' and 'alloy'.
- All terminal leaves in the diagram are labeled 'solid' or 'metallic', indicating the material type at the lowest level of classification.