C12313211232233312111111312111133133313331323133313333232233122132233221   >>    C1231321123223331211111131211113313331333132313331333323223312213223322   <<    C12313211232233312111111312111133133313331323133313333232233122132233223   >>      C12313211232233312111111312111133133313331323133313333232233122132233222   >>