C 4 s 2

C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2
C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2
C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2C 4 s 2