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A spherical octagonal prism with two layers. Placed in midturn.
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 (see the separate entry), the puzzle is additionally cut into two layers along the equator.
In the "advanced" (seen here) version the pattern is more complex.
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