Table:
text: 2007 Czech Republic motorcycle Grand Prix
125cc classification
125cc classification
Rider Manufacturer Laps Time_Retired Grid
Lorenzo Zanetti Aprilia 19 +44.121 20
Raffaele De Rosa Aprilia 19 +44.413 22
Federico Sandi Aprilia 19 +44.468 21
Mike Di Meglio Honda 19 +44.666 19
Roberto Tamburini Aprilia 19 +52.028 14
Nicolás Terol Derbi 19 +57.920 25
Ricard Cardús Aprilia 19 +58.099 30
Joey Litjens Honda 19 +58.538 28
Toni Wirsing Honda 19 +1:10.607 31
Dino Lombardi Honda 19 +1:12.7826 34
Hugo van den Berg Aprilia 19 +1:16.595 26
Danny Webb Honda 19 +1:23.792 32
Dominique Aegerter Aprilia 19 +1:23.879 29
Simone Grotzkyj Aprilia 19 +1:29.979 33
Karel Pešek Aprilia 18 +1 lap 37
Sergio Gadea Aprilia 16 Accident 7

Question: What is the starting grid associated with 18 laps of the 2007 Czech Motorcycling Grand Prix?