Lists, Matrix and String commands 16 5 NEW
| Command | Short Description | |
| PUT | Replace an item in a composite | |
| PUTI | Replace an item and increase index | |
| GET | Extract an item from a composite | |
| GETI | Extract an item and increase index | |
| HEAD | Extract the first item in a composite | |
| TAIL | Removes the first item in a composite | |
| OBJ→ | Explode an object into its components | |
| REPL | Replace elements in a composite | |
| POS | Find the position of an element in a composite | |
| NPOS | Find object in a composite, starting from index N | NEW |
| POSREV | Find the position of an element, starting from the end | NEW |
| NPOSREV | Find the position from the end, starting at index N | NEW |
| SUB | Extract a group of elements from a composite | |
| SIZE | Number of elements in a composite | |
| RHEAD | Returns the last element from the composite | NEW |
| RTAIL | Removes the last element from the composite | NEW |