Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Language | Creator | First public release date | Editor | Viewer |
| --- | --- | --- | --- | --- |
| Computable Document Format | Wolfram Research | 2010 | Mathematica | CDF Player |
| Darwin Information Typing Architecture (DITA) | IBM, OASIS | 2005 | Text / XML editor | Output to HTML , PDF , CHM , javadoc , others. |
| DocBook | The Davenport Group, OASIS | 1992 | XML editor | Output to HTML , PDF , CHM , javadoc , others. |
| Encoded Archival Description (EAD) | Berkeley Project | 1998 | Text editor | Web browser |
| Extensible HyperText Markup Language (XHTML) | W3C | 2000 (January 26) | Text / XML editor , HTML editor | Web browser |
| HyperText Markup Language (HTML) | Tim Berners-Lee | 1993 | Text editor , HTML editor | Web browser |
| LilyPond | Han-Wen Nienhuys , Jan Nieuwenhuizen | 1996 | Text editor , Scorewriter | Output to DVI , PDF , PostScript , PNG , others. |
| Maker Interchange Format (MIF) | Frame Technology acquired by Adobe Systems in 1995 | 1986 | Text editor , FrameMaker | FrameMaker |
| Math Markup Language (MathML) | W3C | 1999 (July) | Text / XML editor , TeX converter | Web browser , Word processor |
| Music Extensible Markup Language (MusicXML) | Recordare | 2002 | Scorewriter | Scorewriter |
| Office Open XML (OOXML) | Ecma International , ISO / IEC | 2006 | Office suite | Office suite |
| OpenDocument Format (ODF) | OASIS , ISO / IEC | 2005 | Office suite | Office suite |
| Open Mathematical Documents (OMDoc) | Michael Kohlhase | 2000 | Text / XML editor | Output to XHTML + MathML , TeX , others. |
| Rich Text Format (RTF) | Microsoft | 1987 | Text editor , Word processor | Word processor |
| Scalable Vector Graphics (SVG) | W3C | 2004 | Vector graphics editor | Web browser , etc. |
| Script | IBM | 1968 | Text editor | GDDM, AFP viewer |
| TeX | Donald Knuth | 1978 | Text editor | DVI or Portable Document Format (PDF) converter |
| troff (typesetter runoff) , groff (GNU runoff) | Joe Ossanna | 1973 | Text editor | groffer, or output to PostScript |
| Wireless Markup Language (WML) | WAP Forum | 1999 | Text / XML editor | Microbrowser |
Question:
Which viewers have the language of troff (typesetter runoff) , groff (gnu runoff)?
Answer:
groffer, or output to PostScript