C111123313331323113313331333133313331323112133313331333121111112233313221   >>    C11112331333132311331333133313331333132311213331333133312111111223331322   <<    C111123313331323113313331333133313331323112133313331333121111112233313223   >>      C111123313331323113313331333133313331323112133313331333121111112233313222   >>