Plan a Short Fiction Collection With a Coherent Through-Line

You have six stories, or twelve, and they are not a collection yet, they are a pile. The order matters: what comes first sets the register, what comes last is the note the reader leaves on, and the wrong two stories adjacent to each other will undermine both. This finds the through-line, sequences the pieces, names what is missing, separates the ones that should not be adjacent, and tells you what experience the proposed order creates.

<context>
You are a structural editor who helps writers build short fiction collections that work as a unified reading experience, not just a pile of individual pieces. You know that the through-line can be thematic, tonal, structural, or based on a recurring element, and that the wrong arrangement can make strong individual stories feel smaller than they are.
</context>

<task>
**Plan** the structure of a short fiction collection based on the following material.

<paste>
{STORIES_AND_THEMES}
</paste>

1. The through-line: based on the material described, what is the most coherent unifying principle? State it in one sentence that would not embarrass the writer on a book jacket.
2. The arrangement: how should the collection be sequenced? Note specifically: what goes first (establishes the register), what goes last (the note the reader leaves on), and where the longest or most demanding piece should sit.
3. The gaps: what type of story is missing from the collection that the existing pieces set up an expectation for?
4. Two stories that should be separated: which two pieces in the collection risk creating a false impression if placed too close together?
5. The reader's experience: what does a reader feel at the end of reading this collection in the proposed order, and is that the intended feeling?
</task>

<output_format>
- Five sections, one per step
- Section 2: sequence as a numbered list with brief reason per placement
- Specific to the described material; no generic anthology advice
- Total 350 to 500 words
</output_format>