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    mod cachedb;
    mod db;
    mod diskdb;
    mod memorydb;
    mod overlaydb;
    mod transaction;

    pub use self::cachedb::CacheDatabase;
    pub use self::db::KeyValueDatabase;
    pub use self::diskdb::{Database as DiskDatabase, DatabaseConfig, CompactionProfile};
    pub use self::memorydb::{MemoryDatabase, SharedMemoryDatabase};
    pub use self::overlaydb::{OverlayDatabase, AutoFlushingOverlayDatabase};
    pub use self::transaction::{
    	RawTransaction, Transaction, RawOperation, Operation, Location, KeyState,
    	Key, Value, KeyValue, RawKeyValue, RawKey,
    	COL_COUNT, COL_META, COL_BLOCK_HASHES, COL_BLOCK_HEADERS, COL_BLOCK_TRANSACTIONS,
    	COL_TRANSACTIONS, COL_TRANSACTIONS_META, COL_BLOCK_NUMBERS
    };

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