C12313211232233312111111312111133133313331323133313333232233323313221323231   >>    C1231321123223331211111131211113313331333132313331333323223332331322132323   <<    C12313211232233312111111312111133133313331323133313333232233323313221323233   >>      C12313211232233312111111312111133133313331323133313333232233323313221323232   >>