C1111133313331323223313331333133313112331322121111331313232212121   >>    C111113331333132322331333133313331311233132212111133131323221212   <<    C1111133313331323223313331333133313112331322121111331313232212123   >>      C1111133313331323223313331333133313112331322121111331313232212122   >>