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Related Clues:
- Accessory device
- Supplementary item
- Feature supplementing standard model
- Enlarge the house
- Accompaniment
- Architect's afterthought
- Like some fees
- Build a new wing, say
- After-market item
- Home improvement
- Building contractor's job
- Software plug-in
- Optional component
- Google Calendar, e.g., informally
- Bonus feature