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:
| Singular abbreviation | Singular Word | Plural abbreviation | Plural Word | Discipline |
| --- | --- | --- | --- | --- |
| d. | didot | dd. | didots | typography |
| f. | following line or page | ff. | following lines or pages | notes |
| F. | folio | Ff. | folios | literature |
| h. | hand | hh. | hands | horse height |
| l. | line | ll. | lines | notes |
| MS | manuscript | MSS | manuscripts | notes |
| op. | opus | opp. | opera | notes |
| p. | page | pp. | pages | notes |
| Q. | quarto | Qq. | quartos | literature |
| s. (or §) | section | ss. (or §§) | sections | notes |
| v. | volume | vv. | volumes | notes |
Question:
The plural word of following lines or pages has what plural abbreviation?
Answer:
ff.