| ⎕IO | |
| ⎕WA | |
| ⎕CR | |
| ⎕TCNL | |
| ---------------------------------------------------- | |
| [ | |
| ["system-function", "⎕IO"], | |
| ["system-function", "⎕WA"], | |
| ["system-function", "⎕CR"], | |
| ["system-function", "⎕TCNL"] | |
| ] | |
| ---------------------------------------------------- | |
| Checks for system functions. |