C12313211232233312111111312111133133313331323133322233121312232211   >>    C1231321123223331211111131211113313331333132313332223312131223221   <<    C12313211232233312111111312111133133313331323133322233121312232213   >>      C12313211232233312111111312111133133313331323133322233121312232212   >>