I'm converting from markdown to epub. I'm trying to understand how Pandoc 
decides when to make a pagebreak. Here's the bit that has me confused:

I had a large markdown file, that I broke up into 5 smaller files. There is 
one h3 header and 10 h4 headers. What I expected was that in the epub 
either the different source files or the different header sections would be 
emitted as separate xhtml files. What I have tho is that all 5 files are 
combined into one xhtml. I made a test doc with the same structure and got 
separate files for each header section. I can't figure out why I get 
different results. Any ideas what I could look for?

The 5 files look like this:

1. file 1

```md
### h3 header

text

#### h4 header 1

text

#### h4 header 2

text
```

2. file 2

```md
#### h4 header 3

text

#### h4 header 4

text
```

3. file 3

```md
#### h4 header 5

text

#### h4 header 6

text
```

4. file 4

```md
#### h4 header 7

text

#### h4 header 8

text
```

5. file 5

```md
#### h4 header 9

text

#### h4 header 10

text
```

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