Index - _
| _1 | Preliminaries |
| _2 | Preliminaries |
| _3 | Preliminaries |
| _4 | Preliminaries |
| _5 | Preliminaries |
| _head | Preliminaries |
| _init | Preliminaries |
| _Just | Preliminaries |
| _last | Preliminaries |
| _Left | Preliminaries |
| _Nothing | Preliminaries |
| _Right | Preliminaries |
| _tail | Preliminaries |