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A spherical octagonal prism with two layers.
Arcturus is the brightest star in the northern hemisphere.
This puzzle was made by Evgeniy Grigoriev based upon an idea by Dmitry Andreev. He wanted to turn his earlier idea Saldamelik (see the separate entry) into an infinity-loop.
In the standard version (see the separate entry) each circle intersects with 4 other circles.
In the "plus" variant (seen here), the puzzle is additionally cut into two layers along the equator.
In the "advanced" (see the separate entry) version the pattern is more complex.
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