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- Model: extends \Magento\Framework\Model\AbstractModel
- ResourceModel: extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
- Collection: extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
- Block : extends \Magento\Framework\View\Element\AbstractBlock
- Helper : extends \Magento\Framework\App\Helper\AbstractHelper
- InstallData: implements InstallDataInterface
- InstallSchema: implements InstallSchemaInterface
- UpgradeData: implements UpgradeDataInterface
- UpgradeSchema: implements UpgradeSchemaInterface