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Or enforceability of the rail + a safety margin // margins from edges h_margin = hole_dist_side*4; v_margin = hole_dist_top*2 + thickness; right_rib_x = width_mm - h_margin; col_left = h_margin; working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns of stuff working_height = height - 25; // build up seven rows; middle one unused row_2 = row_1 + vertical_space/7; row_6 = row_5 + vertical_space/7; row_4 = working_increment*3.

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