C11111333133313232233133313331333133313231312111113113313231333131133133313221   >>    C1111133313331323223313331333133313331323131211111311331323133313113313331322   <<    C11111333133313232233133313331333133313231312111113113313231333131133133313223   >>      C11111333133313232233133313331333133313231312111113113313231333131133133313222   >>