Idamu ngokwalo liyisistimu equkethe izinto zobuchwepheshe kanye nezinto zemvelo, yize zadalwa imisebenzi yabantu. Ukusebenzisana kwezinto zombili (zobuchwepheshe kanye nezemvelo) kuhlanganisa izinselele ekuqapheni, ekubikezeleni, ohlelweni lokusekela izinqumo, kanye nasexwayisweni. Ngokuvamile, kodwa hhayi ngokudingekile, ngubani...
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