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:
| Round | Clubs remaining | Clubs involved | Winners from previous round | New entries this round | Leagues entering at this round |
| --- | --- | --- | --- | --- | --- |
| First round | 156.0 | 86.0 | none | 86 | TFF Third League & Turkish Regional Amateur League |
| Second round | 113.0 | 108.0 | 43 | 65 | Süper Lig & TFF First League & TFF Second League |
| Third round | 59.0 | 54.0 | 54 | none | none |
| Fourth round | 32.0 | 32.0 | 27 | 5 | Süper Lig |
| Fifth round | 16.0 | 16.0 | 16 | none | none |
| Group stage | 8.0 | 8.0 | 8 | none | none |
| Semi-finals | 4.0 | 4.0 | 4 | none | none |
| Final | 2.0 | 2.0 | 2 | none | none |
Question:
Which round has 4 clubs involved?
Answer:
Semi-finals