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:
| Nominative | Ergative | Dative | Genitive | Instrumental | Adverbial |
| --- | --- | --- | --- | --- | --- |
| chem-i | chem-ma | chem-s | chem-i | chem-is | chem-s |
| shen-i | shen-ma | shen-s | shen-i | shen-is | shen-s |
| mis-i | mis-ma | mis | mis-i | mis-i | mis |
| chven-i | chven-ma | chven-s | chven-i | chven-s | chven-s |
| tkven-i | tkven-ma | tkven-s | tkven-i | tkven-s | tkven-s |
| mat-i | mat-ma | mat | mat-i | mat-i | mat |
Question:
What instrumental has tkven-i as the genitive?
Answer:
tkven-s