 
 <prompt> Wetin be variant or reading? Based on di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Wen we dey compare different documents, or "witnesses", of one original text, di differences wey we see dey call variant readings, or simply variants or readings. E no dey always clear which single variant represent di author original work. Di process of textual criticism dey try explain how each variant fit don enter di text, whether by mistake (duplication or omission) or on purpose (harmonization or censorship), as scribes or supervisors dey transmit di original author text by copying am. Di work of di textual critic, therefore, na to sift through di variants, remove those wey dey likely no be original, so as to establish one "critical text", or critical edition, wey dey try best to resemble di original. At di same time, di critical text suppose show di variant readings, so that di relationship of di existing witnesses to di reconstructed original go dey clear to person wey dey read di critical edition. For di work of establishing di critical text, di textual critic dey consider both "external" evidence (di age, origin, and affiliation of each witness) and "internal" or "physical" considerations (wetin di author and scribes, or printers, fit don do). 