C3132121111133313233121111331333133313331333133313331333133313233232212121   >>    C313212111113331323312111133133313331333133313331333133313331323323221212   <<    C3132121111133313233121111331333133313331333133313331333133313233232212123   >>      C3132121111133313233121111331333133313331333133313331333133313233232212122   >>