Does anyone know an RSS feed reader with these features?

1) Deduplication

2) Grouping of articles on the same topic. For example, grouping all articles on Angela Merkel's latest Brexit comments, so I can easily choose one and ignore the rest.

Grouping would make me an order of magnitude more efficient when reading RSS. I'd happily pay $100 for that feature.

Also:

3) Efficiently and automatically manage broken feeds: Automatically retry (over X hours or days), automatically look for a replacement feed, and then let me know which feeds need my attention.