> For the complete documentation index, see [llms.txt](https://sudoku.kazusa.tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sudoku.kazusa.tech/chain-theory/02-x-chain-and-multidigit-chain.md).

# 同数链和异数链

接下来我们针对前面学到的链的逻辑继续进行后面的知识点的学习。