例如，不同字母开头的索引单词可使用不同的文件。
For example, different files could be used for indexed words beginning with different letters.
RxList：RxList意思是“互联网药物索引”，可以通过所给的处方、名字或者就是字母就可以搜索。
RxList is "the Internet drug index," and you search by prescriptions dispensed, names searched or just by letter.
分页器应该传递两个参数：start是按照字母顺序显示的第一幅照片的索引号，step是显示的照片数。
Your pager will be passed two parameters: start, which will be the numeric index of the first photo to show alphabetically; and step, which will be the number of photos to show.
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