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 to | Type | Transfer window | Transfer fee | Source |
| --- | --- | --- | --- | --- | --- | --- |
| GRE | Machlas | Retired | Retirement | Summer | — | contra.gr |
| CYP | Makrides | Metalurh Donetsk | End of contract | Summer | Free | kerkida.net |
| SER | Čorović | AEL Limassol | Loan return | Summer | — | — |
| CYP | Louka | AEL Limassol | End of contract | Summer | Free | kerkida.net |
| GRE | Kapsis | Levadiakos | End of contract | Summer | Free | — |
| CYP | Daskalakis | AEK Larnaca | End of contract | Summer | Free | apoel.net |
| BRA | Zé Carlos | Trofense | Contract termination | Summer | Free | apoelfc.com.cy |
| CYP | Vourkou | Doxa Katokopia | Loan | Summer | Free | — |
| CYP | Panayiotou | Digenis Morphou | Loan | Summer | Free | — |
| MKD | Nikolovski | AEP Paphos | Mutual consent | Winter | Free | — |
| CYP | Papathanasiou | Ermis Aradippou | Loan | Winter | Free | — |
| POR | Paulo Costa | Anorthosis Famagusta | Mutual consent Loan return | Winter | Free | apoelfc.com.cy |
Question:
What is the Nat with a mutual consent loan return and has a free transfer fee?
Answer:
POR