C12313211232233312111111312111133133313331323133323232322123223311   >>    C1231321123223331211111131211113313331333132313332323232212322331   <<    C12313211232233312111111312111133133313331323133323232322123223313   >>      C12313211232233312111111312111133133313331323133323232322123223312   >>