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1. select all files which is not chapters
2. `save as` into a folder
3. delete them
4. create Table of contents
5. add them back
or
1. select all files which is not chapters
2. replace `<h.` to something else (unique)
1. like `<h(.)` to `<#h\1`
4. create Table of contents
5. replace them back
1. like `<#h(.)` to `<h\1`
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