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:
| Nat. | Name | Moving from | Type | Transfer window | Ends | Transfer fee |
| --- | --- | --- | --- | --- | --- | --- |
| NED | Engelaar | Twente | Transfer | Summer | 2011.0 | € 6m |
| PER | Farfán | PSV | Transfer | Summer | 2012.0 | € 10m |
| MAR | Amsif | Youth system | Promotion | Summer | 2010.0 | n/a |
| GEO | Kenia | Youth system | Promotion | Summer | 2012.0 | n/a |
| PER | Zambrano | Youth system | Promotion | Summer | 2012.0 | n/a |
Question:
Which Transfer fee has a Moving from of youth system, and a Nat of mar?
Answer:
n/a