Book-gate in the tale (valvular book) consisting of two parts, books, connected back cover by means of reinforcing a structural member and includes one, two, or more, or none of the following elements: lock, located in the center, connecting the left and right cover; two caches with snaps, code and content, consisting of three barrels with salt, the grain of wheat, and others; musical accompaniment in the form of two tabs, multiple LEDs, solar cells, mikroradioelementov - reproducing tones depending on the combination of notches; Two bell to cover the corners; Two candles with candle holders; notches on the edges of the pages and the arrows pointing to the cuts - to move to another page.
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