user
Instruction
Answer the question based on the provided table.


Table
Table Title: 1930 Rome Grand Prix
Table Content:
| No | Driver | Entrant | Constructor | Chassis | Engine |
| --- | --- | --- | --- | --- | --- |
| 2 | Luigi Arcangeli | Officine Alfieri Maserati | Maserati | Maserati 26M | 2.5 L8 |
| 4 | Louis Chiron | Automobiles Ettore Bugatti | Bugatti | Bugatti T35B | 2.3 L8 |
| 6 | Clemente Biondetti | Scuderia Materassi | Talbot | Talbot 700 | 1.5 L8 |
| 8 | Pietro Nicolotti | Private entry | Alfa Romeo | Alfa Romeo 6C 1500 | 1.5 L6 |
| 10 | Cleto Nenzioni | Private entry | Maserati | Maserati 26B | 2.1 L8 |
| 12 | Luigi Fagioli | Officine Alfieri Maserati | Maserati | Maserati 26 | 1.7 L8 |
| 14 | Fritz Caflisch | Private entry | Mercedes-Benz | Mercedes-Benz SS | 7.1 L6 |
| 16 | Achille Varzi | SA Alfa Romeo | Alfa Romeo | Alfa Romeo P2 | 2.0 L8 |
| 18 | Giuseppe Campari | Scuderia Ferrari | Alfa Romeo | Alfa Romeo 6C 1750GS | 1.8 L6 |
| 20 | Arrigo Sartorio | Private entry | Maserati | Maserati 26 | 1.5 L8 |
| 22 | Mario Tadini | Scuderia Ferrari | Alfa Romeo | Alfa Romeo 6C 1750GS | 1.8 L6 |
| 24 | Heinrich Joachim von Morgen | Private entry | Bugatti | Bugatti T35B | 2.3 L8 |
| 26 | Emil Frankl | Private entry | Steyr | Steyr 4.5 Liter | 4.5 L6 |
| 28 | Tazio Nuvolari | SA Alfa Romeo | Alfa Romeo | Alfa Romeo P2 | 2.0 L8 |
| 30 | Guy Bouriat | Automobiles Ettore Bugatti | Bugatti | Bugatti T35B | 2.3 L8 |
| 32 | Cesare Renzi | Private entry | Bugatti | Bugatti T37A | 1.5 L8 |
| 34 | Cesare Pastore | Private entry | Maserati | Maserati 26B | 2.1 L8 |
| 36 | Colonna de Stigliano | Private entry | Alfa Romeo | Alfa Romeo 6C 1750 | 1.8 L6 |
| ? | Filippo Sartorio | Enrico or F. Sartorio | Alfa Romeo | Alfa Romeo 6C 1750 | 1.5 L6 |
| ? | Arrigo Nenzioni | A. or E. Nenzioni | Maserati | Maserati 26 | 1.5 L8 |
| ? | William Grover-Williams | Automobiles Ettore Bugatti | Bugatti | Bugatti T35B | 2.3 L8 |
| ? | ? | Scuderia Ferrari | Alfa Romeo | Alfa Romeo P2 | 2.0 L8 |
| ? | ? | Scuderia Ferrari | Alfa Romeo | Alfa Romeo 6C 1500 | 1.5 L6 |


Question
how many private entries were there in this race?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["9"]