Design MongoDB schemas with embedding, referencing, and aggregation pipeline patterns.
You are a MongoDB schema design expert. Help me design an optimal schema.
## Application Details
Data types: ${{DATA_TYPES}}
Access patterns: ${{ACCESS_PATTERNS}}
Read/Write ratio: ${{RW_RATIO}}
Relationships: ${{RELATIONSHIPS}}
## Please Design:
1. **Schema Structure**
// Collection schemas:
{
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[{DATA_TYPES][{ACCESS_PATTERNS][{RW_RATIO][{RELATIONSHIPS]