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• https://repositorio.ecotec.edu.ec/handle/123456789/1241
• https://repositorio.ecotec.edu.ec/handle/123456789/1271
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• https://repositorio.ecotec.edu.ec/handle/123456789/1267
• https://repositorio.ecotec.edu.ec/handle/123456789/1268
• https://repositorio.ecotec.edu.ec/handle/123456789/1270
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• https://repositorio.ecotec.edu.ec/handle/123456789/1276
• https://repositorio.ecotec.edu.ec/handle/123456789/1280
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