whether 이하의 문장에서 discrepancies between A or B 같은데 잘 모르겟네요... 중간에 or이 있어서 ...혹시 아시는분 도와주세요ㅠ

Phrap also uses Phred quality scores to estimate whether discrepancies between two overlapping sequences are more likely to arise from random errors, or from different copies of a repeated sequence.