Task: NL2SQL (source dataset: WikiSQL)

Natural language to SQL, also known as NL2SQL, is the problem of generating a SQL query that can be executed on a input table, for a given natural language question.

You will be given an input table called "table" in the markdown format, as well as a question. Your task is to generate an SQL query that can be executed on the input table to answer the question.

Please ensure that the generated SQL only return relevant columns being specifically asked in the question (e.g., in SQL please don't return more than one columns in SELECT if only one column is needed to answer the given question, and similarly please refrain from using SELECT * unless the entire row is needed to answer the question).
 
When generating SQL code, please use the SQLite syntax to ensure that your SQL is executable on SQLite3. Use only columns that are present in the table, always use quotes around your column and table names (some column names have punctuation or special characters), and refer to the columns using the column-names exactly as they appear in the table, do not add or remove punctuation (underscore, slash, etc.)

No explanation, return the code only with the following markdown codeblock format : ```sql<SQL CODE>```. For example, ```sql
SELECT * FROM "table"
``` is a valid format.

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)?

table_id: 1-1574968-1
label: SELECT "Viewer" FROM "table" WHERE "Language" = "troff (typesetter runoff) , groff (GNU runoff)"