C12313211232233312111111312111133133313331323133322233121323221   >>    C1231321123223331211111131211113313331333132313332223312132322   <<    C12313211232233312111111312111133133313331323133322233121323223   >>      C12313211232233312111111312111133133313331323133322233121323222   >>