Ukuqoqa izimpahla ezivela kubahlinzeki abahlukene endaweni eyodwa bese zithunyelwa njengempahla eyodwa ethunyelwayo.
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Ukuhlanganisa izimpahla kusho ukuqoqa imikhiqizo ethengwe kubahlinzeki abaningana enqolobaneni eyodwa bese iyahlanganiswa ibe ukuthunyelwa okukodwa. Esikhundleni sokuthunyelwa okuningi okuncane, kuphathwa ukuthunyelwa okukodwa neqoqo elilodwa lamadokhumenti.
Ekuthuthweni ngolwandle, impahla engagcwalisi isiqukathi ingathunyelwa njengomthwalo ongaphansi kwesiqukathi (LCL), kanti egcwalisayo njengomthwalo wesiqukathi esigcwele (FCL). Ukuhlanganisa kwenza kube lula nokuhlola ukuthi iyiphi indlela efanele kakhudlwana.