C k v

C k vC k vC k vC k v
C k vC k vC k vC k vC k vC k vC k vC k v
C k vC k vC k vC k vC k vC k vC k vC k vC k vC k vC k vC k v
C k vC k vC k vC k vC k vC k vC k vC k vC k vC k vC k vC k v