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:
| noun root (meaning) | case suffix (case) | postposition | full word | English meaning |
| --- | --- | --- | --- | --- |
| megobar- (friend) | -is (genitive) | -tvis | megobrebistvis | for friends |
| deda- (mother) | -s (dative) | -tan ertad | dedastan ertad | (together) with (my) mother |
| mshobl- (parent) | -is (genitive) | gareshe | mshoblebis gareshe | without (my) parents |
| shen- (you) | -s (genitive) | gamo | shens gamo | because of you |
| bavshv- (child) | -i (nominative) | -vit | bavshvivit | like (a) child |
| bavshv- (child) | -sa (dative) | -vit | bavshvebisavit | like children |
| Sakartvelo- (Georgia) | -s (dative) | -shi (drops case suffix) | Sakartveloshi | to Georgia, in Georgia |
| xval- (tomorrow) | -ad (adverbial) | -mde (drops d) | xvalamde | up to (until) tomorrow |
Question:
What is Case Suffix (Case), when Postposition is "-mde (drops d)"?
Answer:
-ad (adverbial)