user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Transfers in' regarding '1957–58 Port Vale F.C. season'
Table Content:
| Date from | Position | Nationality | Name | From | Fee | Ref. |
| --- | --- | --- | --- | --- | --- | --- |
| June 1957 | FW | England | Jack Wilkinson | Sheffield United | Free transfer | - |
| July 1957 | MF | Scotland | Bert Carberry | Gillingham | Free transfer | - |
| July 1957 | GK | Wales | Keith Jones | Aston Villa | £3,500 | - |
| July 1957 | MF | England | Alan Martin | Bangor City | Non-contract | - |
| November 1957 | MF | England | Bill Cleary | Wisbech Town | Free transfer | - |
| February 1958 | FW | Wales | Noel Kinsey | Birmingham City | £5,000 | - |
| March 1958 | FW | Scotland | Jimmy McLean | Alva Rangers | Free transfer | - |


Question
Which signings of the 1957–58 Port Vale F.C. season occurred in June or July?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Four of these signings were: forward Jack Wilkinson (Sheffield United); goalkeeper Keith Jones (signed from Aston Villa for £3,500); Bert Carberry (Gillingham); and Alan Martin."]