"ref"=>"29","design"=>"three-level","structure"=>"tubular","line_attachment"=>"anchor"
"ref"=>"30","design"=>"three-level","structure"=>"tubular","line_attachment"=>"anchor"
"ref"=>"36","design"=>"three-level","structure"=>"tubular"
"ref"=>"37","design"=>"three-level","structure"=>"tubular"