Ha o batla libotlolo tsa tlatsetso, Vanson o fana ka libotlolo tse chitja tsa meriana tse tšoeu tse kopantsoeng le likatiba tse tšoeu tsa PE tse nang le likhopo.Mahetla a chitja, mahlakore a otlolohileng, le motheo o tiileng li etsa hore libotlolo tsena tsa sephutheloana sa lipilisi e be khetho e holimo ha li paka mefuta e mengata ea lihlahisoa.Ka mefuta e mengata e fapaneng ea boholo bo ka har'a libotlolo tse chitja tsa meriana, lijana tsena tse tšoarellang li ka thusa ho theha mohala o felletseng oa libotlolo tsa tlatsetso, litlhare tsa OTC, le tse ling.