Delete old duckdb index files

as/test/index.duckdb

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as/train/index.duckdb

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as/validation/index.duckdb

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bn/test/index.duckdb

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bn/train/index.duckdb

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bn/validation/index.duckdb

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hi/test/index.duckdb

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hi/train/index.duckdb

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hi/validation/index.duckdb

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kn/test/index.duckdb

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kn/train/index.duckdb

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kn/validation/index.duckdb

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ml/test/index.duckdb

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ml/train/index.duckdb

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ml/validation/index.duckdb

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or/test/index.duckdb

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or/train/index.duckdb

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or/validation/index.duckdb

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pa/test/index.duckdb

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pa/train/index.duckdb

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pa/validation/index.duckdb

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ta/test/index.duckdb

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ta/train/index.duckdb

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ta/validation/index.duckdb

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te/test/index.duckdb

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te/train/index.duckdb

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te/validation/index.duckdb

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