Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       artefacta - artefacts
         Product group materials
           Product group fibers
             Product group manufactured fibers (FTC)
               Product group synthetic fibers
                 Product olefin fiber (FTC)
                   1 Product lastol fiber (FTC)
                   2 Product polyethylene fiber
                   3 Product polypropylene fiber