Delete old duckdb index files

2011.main.DE/train/index.duckdb

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2011.main.EN/train/index.duckdb

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2011.main.ES/train/index.duckdb

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-oid sha256:ce73904d0eb66583e9307f2d5d07c6efd375c39fac7bf3d626cbb4e211712252
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2011.main.IT/train/index.duckdb

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-oid sha256:ba428dd2f710927a3da48eefe195864337bb6afa57b3a51340b6f2a40285ca34
-size 2895872

2011.main.RO/train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
-oid sha256:7e3f7a0fcef3c05b75e3735a0fecbfaa86899bb991cc00ca7423f52b04e35b64
-size 3158016

2012.alzheimers.EN/train/index.duckdb

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2012.main.AR/train/index.duckdb

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-size 2109440

2012.main.BG/train/index.duckdb

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-size 2109440

2012.main.DE/train/index.duckdb

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2012.main.EN/train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
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2012.main.ES/train/index.duckdb

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2012.main.IT/train/index.duckdb

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-oid sha256:454fd56efa08ceb9923e432a13925effc4a0a7f41cd474518b956046636929f2
-size 3420160

2012.main.RO/train/index.duckdb

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-oid sha256:a7bc0198fcddd928bcddad3d3cb6bc1d1870864c0a9725aaa7f874267c22aed0
-size 3420160

2013.alzheimers.EN/train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
-oid sha256:779fead9cc813f853d55fdef69b616d1b8e89d350ed0d8f655ef94ece1ea3b9a
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2013.entrance_exam.EN/train/index.duckdb

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2013.main.AR/train/index.duckdb

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2013.main.BG/train/index.duckdb

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-size 2633728

2013.main.EN/train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
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2013.main.ES/train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
-oid sha256:22d5acba9847aa0dde565d3b9149c657b97d3667bdd6e30f74a4d8eec4d09e08
-size 5517312

2013.main.RO/train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
-oid sha256:067826e393bb89a56113534cb679e6120c06156320e54a23687e9db24cea7fe5
-size 5779456