C1111233131211111211113313331333133313331322322331323133313113232223221   >>    C111123313121111121111331333133313331333132232233132313331311323222322   <<    C1111233131211111211113313331333133313331322322331323133313113232223223   >>      C1111233131211111211113313331333133313331322322331323133313113232223222   >>