patterns and classifications造句

This thesis is composed of four parts as follows : part introduces fundamental theories of international factoring contract firstly , the author introduces the definition , operation patterns and classification of international factoring , and then discusses its legal basis , which is advocated to be the assignment of creditors " rights , that is , the assignment of account receivables . secondly , the author analyses the conditions that international factoring contract should have so that it can meet the statutory requirements and come into existence legally
第一部分为国际保理协议的一般原理：首先，简要介绍了国际保理基础理论，包括国际保理的定义、服务内容、运作模式和分类，并论证了国际保理的法律基础应为债权转让，即应收账款转让；其次，讨论了国际保理协议成立的重要性及其成立的条件，并介绍了国际保理协议的分类。
It's difficult to find patterns and classifications in a sentence. 用patterns and classifications造句挺难的