Indian yogis used the following training. The branches of different length find bend were thrown on a board. Thrown on a board. Then the branches were mixed together. The search of nirvana state yogi had to restore the initial position of the branches. Thus training was considered to develop inner concentration and inner vision.  By the way: Treads puzzle 4 can be purchased with PayPal, Visa, Master Card, Wire transfer, Money Order just for $15.00
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