http://stackoverflow.com/questions/21390424/propagate-coredata-changes-to-related-objects
http://stackoverflow.com/questions/24815138/how-to-detect-changes-in-core-data-relationship
http://stackoverflow.com/questions/4631755/core-data-dependent-property-on-to-many-relationship
http://stackoverflow.com/questions/6173534/core-data-observing-changes-in-related-entities
http://stackoverflow.com/questions/10587767/detecting-many-to-many-relationship-changes-in-coredata
http://stackoverflow.com/questions/2875406/setting-up-a-to-many-relationship-value-dependency-for-a-transient-core-data-a?rq=1
http://stackoverflow.com/questions/15658518/kvo-addobserver-to-coredata-objects-one-to-many-relationship

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