Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
LaTexを使用して2つのPDFファイルに参加するコードを教えてください。

### Response:

\ documentclass {記事}
\ usepackage {pdfpages}

\ begin {document}
\ includepdf [pages =  - ] {file1.pdf}
\ includepdf [pages =  - ] {file2.pdf}
\ end {document}