C

C 1

C 2

C 3

C n

C 1

1

a 12

a 13

a 1 n

C 2

1

a 23

a 2 n

C 3

1 / a 13

1 / a 23

1

a 3 n

1

C n

1 / a 1 n

1 / a 2 n

1 / a 3 n

1