C11111333133313232233133313331333133313231312111113113313112121   >>    C1111133313331323223313331333133313331323131211111311331311212   <<    C11111333133313232233133313331333133313231312111113113313112123   >>      C11111333133313232233133313331333133313231312111113113313112122   >>