how many private entries were there in this race?
9
col : no | driver | entrant | constructor | chassis | engine row 1 : 2 | luigi arcangeli | officine alfieri maserati | maserati | maserati 26m | 2.5 l8 row 2 : 4 | louis chiron | automobiles ettore bugatti | bugatti | bugatti t35b | 2.3 l8 row 3 : 6 | clemente biondetti | scuderia materassi | talbot | talbot 700 | 1.5 l8 row 4 : 8 | pietro nicolotti | private entry | alfa romeo | alfa romeo 6c 1500 | 1.5 l6 row 5 : 10 | cleto nenzioni | private entry | maserati | maserati 26b | 2.1 l8 row 6 : 12 | luigi fagioli | officine alfieri maserati | maserati | maserati 26 | 1.7 l8 row 7 : 14 | fritz caflisch | private entry | mercedes-benz | mercedes-benz ss | 7.1 l6 row 8 : 16 | achille varzi | sa alfa romeo | alfa romeo | alfa romeo p2 | 2.0 l8 row 9 : 18 | giuseppe campari | scuderia ferrari | alfa romeo | alfa romeo 6c 1750gs | 1.8 l6 row 10 : 20 | arrigo sartorio | private entry | maserati | maserati 26 | 1.5 l8 row 11 : 22 | mario tadini | scuderia ferrari | alfa romeo | alfa romeo 6c 1750gs | 1.8 l6 row 12 : 24 | heinrich joachim von morgen | private entry | bugatti | bugatti t35b | 2.3 l8 row 13 : 26 | emil frankl | private entry | steyr | steyr 4.5 liter | 4.5 l6 row 14 : 28 | tazio nuvolari | sa alfa romeo | alfa romeo | alfa romeo p2 | 2.0 l8 row 15 : 30 | guy bouriat | automobiles ettore bugatti | bugatti | bugatti t35b | 2.3 l8 row 16 : 32 | cesare renzi | private entry | bugatti | bugatti t37a | 1.5 l8 row 17 : 34 | cesare pastore | private entry | maserati | maserati 26b | 2.1 l8 row 18 : 36 | colonna de stigliano | private entry | alfa romeo | alfa romeo 6c 1750 | 1.8 l6 row 19 : ? | filippo sartorio | enrico or f. sartorio | alfa romeo | alfa romeo 6c 1750 | 1.5 l6 row 20 : ? | arrigo nenzioni | a. or e. nenzioni | maserati | maserati 26 | 1.5 l8 row 21 : ? | william grover-williams | automobiles ettore bugatti | bugatti | bugatti t35b | 2.3 l8 row 22 : ? | ? | scuderia ferrari | alfa romeo | alfa romeo p2 | 2.0 l8 row 23 : ? | ? | scuderia ferrari | alfa romeo | alfa romeo 6c 1500 | 1.5 l6
how many private entries were there in this race?
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
9