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softer:rubber,
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porous:material,
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rough:material,
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flexible:material,
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cellular:material,
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soft:material,
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compressible:material,
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elastic:material,
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impervious:material,
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cellular:structure,
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natural:foam,
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resilient:material,
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frictional:material,
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plastic:material,
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cheap:material,
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resilient:particle,
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conventional:material,
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porous:rubber,
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cellular:elastomer,
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synthetic:material,
Category Nuances for sponge_rubber:
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cellular,
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compressible,
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porous,
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synthetic,
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natural,
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rough,
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soft,
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plastic,
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cheap,
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resilient,
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conventional,
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frictional,
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elastic,
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flexible,
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impervious,
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softer,
Simple Categories for sponge_rubber: