C12313211232233312111111312111133133313331323133313332322331212222231133233221   >>    C1231321123223331211111131211113313331333132313331333232233121222223113323322   <<    C12313211232233312111111312111133133313331323133313332322331212222231133233223   >>      C12313211232233312111111312111133133313331323133313332322331212222231133233222   >>