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:
| Free | Free polite | Genitive 1 | Genitive 2 | Genitive 3 |
| --- | --- | --- | --- | --- |
| *[i-]aku | – | *=ku | *maku | *n-aku |
| *[i-]Su | *[i-]ka-Su | *=Su | *miSu | *ni-Su |
| *s(i)-ia | – | (*=ia) | – | *n(i)-ia |
| *i-ami | *[i-]k-ami | *=mi | *mami | *n(i)-ami |
| *([i])ita | *[i-]k-ita | *=ta | *mita | *n-ita |
| *i-amu | *[i-]k-amu | *=mu | *mamu | *n(i)-amu |
| *si-da | – | (*=da) | – | *ni-da |
Question:
Which Free polite has a Genitive 3 of *ni-da?
Answer:
–