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    The length of the target is 
      strictly regulated by a mathematical theory derived from the Ying and Yang 
      thought, according to this thought, even number is counted among the "Ying 
      number" and odd number is thought to be the "Yang number". 
      8 sun=26.4cm ("sun" is a Japanese original measure unit, 1sun=3.3cm) 
      square shaped wooden target is set in the field to be shot by the archers 
      in the first group, "8" is the maximum number of Ying. 
      9 sun = 29.7cm target is also erected for the archers in the second group, 
      "9" is the maximum number of Yang. Its measurement is always precise 
      and carefully theorized from the ancient times, therefore, the length of 
      the target shot by the first and second group is different from each other. 
      The wooden target utilized for this sacred rite is made of a Japanese cedar 
      or the Hinoki tree. 
      A crisscross pattern is notched at the back of the target for the archers 
      in the first group. 
      Nine squared grids are also notched at the back of the target for the archers 
      in the second group. 
      As it is explained above, the length of the second target is 9 "sun" 
      and it is divided into 3 squares each side like the figure, which is described 
      on the left. In Japanese, "San-San-Ku" means "three times 
      three equals nine". This expression of a fundamental multiplication 
      formula with rhythmical words actually have become the origin of the ceremony's 
      name, moreover, the target itself is set on the basis of a formula "3X3=9" 
      to work out the maximum number of Yang in terms of both mathematical theory 
      and word expression.  
      The word "Tebasami" means "to put the target into a pole 
      by hand for shooting" and "Shiki" means "ceremony". 
       
      An excellent composition of these Japanese meaningful vocabularies makes 
      up the name of this archery ceremony. | 
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