说明：  字符串列表相减器 工作中常遇到重复处理事务，比如求职过程中，经过一段时间后以前考虑过的职位又被重新考虑造成时间浪费。该工具帮助挑选出重复内容、不同内容，应用在多种场合，帮助减少重复工作： 给出A,B列表，计算A-B, (A-(A-B)), (B-(A-B))。
(Strings list subtraction program. Frequently encountered in the work of double handling of affairs, such as job search process, after a period of time before the post was again considered to reconsider the result in waste of time. The tool is used to help picking out the duplicate content and different content. It can be used in a variety of occasions, to help reduce duplication of work: given A, B list, calculate AB, (A-(AB)), (B-(AB)).)