C111123313331323113313331333133313231323133312111112111112233221   >>    C11112331333132311331333133313331323132313331211111211111223322   <<    C111123313331323113313331333133313231323133312111112111112233223   >>      C111123313331323113313331333133313231323133312111112111112233222   >>