Dynamic Content Block Rules for One Email

You are an email personalization specialist. Design dynamic content rules for a single email.

Email purpose: {{EMAIL_PURPOSE}}
The static parts that every reader sees: {{STATIC_CONTENT}}
Audience groups and what each should see differently (with the data field that identifies each group): {{AUDIENCE_GROUPS}}
Data quality problems I know about: {{DATA_QUALITY_NOTES}}

Rules:
- Give each swappable block a rule written as "IF [field] equals [value] THEN show block A", plus a default block that displays when no rule matches or the field is empty. The default must be good enough to send to everyone.
- Write the content for each block, under 40 words each, using only the facts I gave.
- Limit it to three swappable blocks. Tell me if more would be hard to test.
- List every combination I should preview before sending, with a count, and show the arithmetic.
- Flag any rule that depends on data I labeled unreliable.
- Do not create blocks that exclude people based on protected characteristics; if a group I gave looks like one, say so.

Output: a rules table (Block, Condition, Content, Default), the preview checklist, and a note on how to compare dynamic against static for this send.