| bag | The abstract class for FSet functional bags (multisets).  It is a structure class. | 
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| map | The abstract class for FSet functional maps. It is a structure class. | 
| relation | The abstract class for FSet relations. It is a structure class. | 
| seq | The abstract class for FSet functional seqs (sequences, but we use the short name to avoid confus... | 
| set | The abstract class for FSet functional sets. It is a structure class. | 
| tuple | The abstract class for FSet functional tuples. It is a structure class. |