The rebellion <https://docs.racket-lang.org/rebellion/index.html> package 
recently acquired a few new collection libraries:

   - rebellion/collection/multiset 
   <https://docs.racket-lang.org/rebellion/Multisets.html> - A library for 
   *multisets*, which are like sets that can contain duplicate values
   - rebellion/collection/multidict 
   <https://docs.racket-lang.org/rebellion/Multidicts.html> - A library for 
   *multidicts,* which are like hashes from keys to sets of values
   - rebellion/collection/association-list 
   <https://docs.racket-lang.org/rebellion/Association_Lists.html> - A 
   library for *association lists*, which are like hashes from keys to 
   lists of values
   - rebellion/collection/entry 
   <https://docs.racket-lang.org/rebellion/Entries.html> - A small 
   supporting library that defines an (entry key value) struct, in order to 
   make it clearer when a pair is being used as a key-value mapping rather 
   than as an arbitrary pair

All of the new collection types are immutable, but they don't (yet) support 
efficient persistent updates (e.g. there's no multiset-add function yet). 
These libraries are currently in early alpha versions, so not much beyond 
the basics is implemented and their APIs might change without warning. Let 
me know what you think and please feel free to file feature requests and 
bugs in the rebellion github repository 
<https://github.com/jackfirth/rebellion>!

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