Page_spacing_result space_systems_on_2_pages (vsize configuration_index, vsize first_page_num);
Page_spacing_result finalize_spacing_result (vsize configuration_index, Page_spacing_result);
void create_system_list ();
Page_spacing_result space_systems_on_2_pages (vsize configuration_index, vsize first_page_num);
Page_spacing_result finalize_spacing_result (vsize configuration_index, Page_spacing_result);
void create_system_list ();