Github user afs commented on the pull request:
https://github.com/apache/jena/pull/123#issuecomment-181853168
Would it be possible to use one of the Guava `Multi*` classes? Maybe in
`Map<K, MultiSet<V>>` (a map to a counting set). There are other `Multi*` one
of which might even do this all directly but I can't find one ATM.
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