1.000: C0 arrived [ ]
1.000: C0 service begin (by S0)
2.000: C0 service done (by S0)
2.000: C0 departed
3.000: C1 arrived [ ]
3.000: C1 service begin (by S0)
4.000: C1 service done (by S0)
4.000: C1 departed
5.000: C2 arrived [ ]
5.000: C2 service begin (by S0)
6.000: C2 service done (by S0)
6.000: C2 departed