1.Umshini wonke wamukela uhlelo lokulawula lwe-PLC oluvuthiwe, okwenza wonke umshini usebenze ngokuzinzile nangesivinini esikhulu.
I-2.Idivayisi yokuhlukanisa ibhodlela yomhlaba wonke, asikho isidingo sokushintsha izesekeli zanoma yiliphi ibhodlela lobubanzi, ukulungiswa okusheshayo nokubeka indawo.
I-3.Isistimu yokusebenza ithatha isilawuli sesikrini sokuthinta, okulula ukusebenza, esisebenzayo futhi esiphumelelayo.
4.Isivinini sokulebula kanye nesivinini sokudlulisa singabona ukulawulwa kwesivinini esingenasinyathelo, esingalungiswa njengoba kudingeka.