t = 0

C1

0

0

0

t = 0.5

C1

0

0

0

t = 1

C1

0

0

0

t = 1.5

C4

C2

0

0

t = 2

C4

C2

C3

0

t = 2.5

C4

C2

C3

0

t = 3

0

0

C3

0