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2, often played before 2, to build up seven rows; middle one unused row_7 = row_6 + vertical_space/7; row_7 = row_6 + vertical_space/7; row_5 = working_increment*4 + row_1; working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; working_increment .

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