| Class | Description | 
|---|---|
| AllFields | |
| AllObjects | |
| SeqConcat | |
| SeqGet | 
 Represents a sequence getter function. 
 | 
| SeqIndexOf | 
 Represents a function giving the index of some element in a sequence (if it exists). 
 | 
| SeqLength | 
 Represents a function giving the length of  a sequence. 
 | 
| SeqReverse | |
| SeqSingleton | |
| SeqSub | |
| SetMinus | |
| SetUnion | |
| Singleton |