Index - O
| odd | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| on | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| onException | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| openBinaryFile | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| openBinaryTempFile | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| openBinaryTempFileWithDefaultPermissions | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| openFile | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| OpenPunctuation | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| openTempFile | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| openTempFileWithDefaultPermissions | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| optional | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| or | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| Ord | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| ord | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| Ordering | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| os | Hydrogen.Prelude.System |
| OtherLetter | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| OtherNumber | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| OtherPunctuation | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| OtherSymbol | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| otherwise | Hydrogen.Prelude, Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| outputNL | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |
| Overflow | Hydrogen.Prelude.IO, Hydrogen.Prelude.System |