C11111211113313112113313331333133313331333132322121111121111331333131231212121   >>    C1111121111331311211331333133313331333133313232212111112111133133313123121212   <<    C11111211113313112113313331333133313331333132322121111121111331333131231212123   >>      C11111211113313112113313331333133313331333132322121111121111331333131231212122   >>