user
Instruction
Answer the question based on the provided table.


Table
Table Title: Duilio Beretta
Table Content:
| No. | Date | Tournament | Surface | Partnering | Opponent in the final | Score |
| --- | --- | --- | --- | --- | --- | --- |
| 1. | September 13, 2010 | Ecuador F2 | Hard | Roberto Quiroz | Peter Aarts\n Christopher Racz | 6–4, 6–4 |
| 2. | April 4, 2011 | Chile F2 | Clay | Sergio Galdós | Guillermo Hormazábal\n Rodrigo Pérez | 5–7, 7–6(5), [10–5] |
| 3. | April 11, 2011 | Chile F3 | Clay | Roberto Quiroz | Luis David Martínez\n Miguel Ángel Reyes-Varela | 6–4, 7–5 |
| 4. | August 8, 2011 | Peru F1 | Clay | Sergio Galdós | Martín Cuevas\n Guido Pella | 6–4, 6–0 |
| 5. | August 5, 2012 | Manta | Hard | Renzo Olivo | Víctor Estrella\n João Souza | 6–3, 6–0 |
| 6. | August 20, 2012 | Colombia F2 | Clay | Ariel Behar | Nicolas Barrientos\n Michael Quintero | 2-1 Ret. |
| 7. | August 26, 2012 | Ecuador F3 | Clay | Sergio Galdós | Mauricio Echazú\n Guillermo Rivera-Aránguiz | 6-2, 6-1 |
| 8. | October 8, 2012 | Chile F8 | Clay | Gustavo Sterin | Cristóbal Saavedra-Corvalán\n Guillermo Rivera-Aránguiz | 6-4, 7-5 |
| 9. | May 13, 2013 | Argentina F6 | Clay | Sergio Galdós | Franco Agamenone\n Jose Angel Carrizo | 4-6, 6-4, [10–1] |
| 10. | May 27, 2013 | Argentina F8 | Clay | Sergio Galdós | Daniel Dutra da Silva\n Pablo Galdón | 6-0, 7-5 |


Question
which month(s) had the least amount of tournaments?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["September", "October"]