to apply multi-level collation. In the multi-level collation, the primitive forms of the entries are first compared with the cases of the forms and diacritics ignored. If the forms are the same, the diacritics of the forms are compared. If the forms are still the same, the cases, character widths, and Japanese Kana differences of the forms are compared.
可进行多级排序。在多级排序中，条目可以首先按基本形式进行比较，忽略其大小写和音调符号。如果形式相同，则比较音调符号。如果形式仍然相同，则比较大小写、字符宽度和日文假名差异。