Given its characteristics, is the variable, there are three different types of knives, all characteristics of the area in front of the butt of a knife, cut 2 (round & oval-shape) and the size of the sample that is 50 percent and 95 where the tile 5. Define the variable as the burden of the muscles. A right-handed professional satisfaction in the implementation And set the control variable is the size of a sharp knife, there are 8 degrees to the tire size circumference on average 1500 mm height of the slit to the waist-level in the range of eye level and tilt angle of 35 degrees to the front tire on a horizontal plain.
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