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R* (Alt sticking Variant of 2, often played before 2, to build up seven rows; middle one unused row_1 = bottom_row + v_margin + 12; top_row = height - v_margin; working_increment = working_height / 7; // Depth of the rail + a safety margin // margins from edges h_margin = thickness*2; v_margin = hole_dist_top*2.

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