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+ ((360 / cone_indents_count) * z)] sphere(r = sphere_indents_radius, $fn = 3, center = false); z_position = height - 25; // build up seven rows; middle one unused row_2 = row_1 + vertical_space/7; row_6 = row_5 + vertical_space/7; row_6 = row_5 + vertical_space/7; row_3 = row_2 + vertical_space/7; row_4 = row_3 + vertical_space/7; row_7 = row_6 .

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