| Symbol | Specification | Kind | Type |
|---|---|---|---|
| . + . | nat-basic | f | Nat × Nat → Nat |
| . +1 | nat-basic | f | Nat → Nat |
| . -1 | nat-basic | pf | Nat → Nat with λ n. n ≠ 0 |
| . < . | nat-basic | p | Nat × Nat |
| Elem | elem | s | |
| Nat | nat-basic | s | |
| a | choice | v | Elem |
| aa | choice | c | Elem |
| b | choice | v | Elem |
| c | choice | v | Elem |
| elemf | choice | v | Elem → Elem |
| m | choice | v | Nat |
| n | choice | v | Nat |
| nf | choice | v | Nat → Elem |
| nfgen | choice | v | Nat → Nat → Elem |
| ok | choice | p | Elem |
| rel | choice | p | Elem × Elem |