10 rods identical with the Red Rods (Sensorial) in length but divided into red and blue sections. The shortest rod is red. The second rod is twice the length of the first: half is painted red, the other half blue. The third rod is three times the length of the first. It is divided into three sections: the first painted red, the second blue, the third red. All the other rods are divided in a similar fashion alternating red and blue, the first section always being red.
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