Task: Question Answering
Input (English): This step was followed by a pre-processing stage where the texts were normalized by replacing zero-width-non-joiner (ZWNJ) BIBREF2 and manually verifying the orthography based on the reference orthography of the Kurdistan Region of Iraq. 
 Question: How is the corpus normalized?
Output (English): by replacing zero-width-non-joiner (ZWNJ) BIBREF2 and manually verifying the orthography