C12313211232233312111111312111133133313331323133313332322331212221233132211321   >>    C1231321123223331211111131211113313331333132313331333232233121222123313221132   <<    C12313211232233312111111312111133133313331323133313332322331212221233132211323   >>      C12313211232233312111111312111133133313331323133313332322331212221233132211322   >>