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marine:material,
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natural:object,
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animal:artefact,
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local:commodity,
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natural:material,
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valuable:material,
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animal:artifact,
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harder:material,
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large:bone,
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hard:item,
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defensive:mechanism,
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out:item,
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hard:substrate,
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environmental:object,
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tough:surface,
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nonmetal:artifact,
Category Nuances for turtle_shell:
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environmental,
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natural,
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hard,
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harder,
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tough,
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animal,
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local,
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nonmetal,
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marine,
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out,
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large,
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valuable,
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defensive,
Simple Categories for turtle_shell:
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material,
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artifact,
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commodity,
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object,
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substrate,
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item,
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bone,
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surface,
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mechanism,
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artefact,