C12313211232233312111111312111133133313331323133323232322123212121   >>    C1231321123223331211111131211113313331333132313332323232212321212   <<    C12313211232233312111111312111133133313331323133323232322123212123   >>      C12313211232233312111111312111133133313331323133323232322123212122   >>