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Mixed Modulestore (Facade)
https://github.com/edx/edx-platform/wiki/Mixed-Modulestore
Different Modulestore Iterations
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http://doctoryes.github.io/mug_talk_modulestore/#1
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https://github.com/edx/edx-platform/wiki/Mixed-Modulestore
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http://doctoryes.github.io/mug_talk_modulestore/#1