CrossFit Games 2013 Open WOD 13.4 Workout

Complete as many reps as possible in 7 minutes following the rep scheme below:
60 kg Clean and jerk, 3 reps
3 Toes-to-bar
60 kg Clean and jerk, 6 reps
6 Toes-to-bar
60 kg Clean and jerk, 9 reps
9 Toes-to-bar
60 kg Clean and jerk, 12 reps
12 Toes-to-bar
60 kg Clean and jerk, 15 reps
15 Toes-to-bar