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    /**
     * Gets all the key-value pairs in the existing windows.
     * 
     * @returns an iterator over windowed key-value pairs {@code <Windowed<K>, value>}
     * @throws InvalidStateStoreException if the store is not initialized
     * @throws NullPointerException if null is used for any key
     */
    KeyValueIterator<Windowed<K>, V> all();

    /**
     * Gets all windows for a specific time range
     * 
	 * @param timeFrom the beginning of the time slot from which to search
	 * @param timeTo   the end of the time slot from which to search
     * @returns an iterator over windowed key-value pairs {@code <Windowed<K>, value>}
	 * @throws InvalidStateStoreException if the store is not initialized
     * @throws NullPointerException if null is used for any key
     */
    KeyValueIterator<Windowed<K>, V> range(long timeFrom, long timeTo);