Ya, i think oxford Mushroom illustrate it clearer...
but on an interesting note, that because of political reasons, ICAO
wasn't able to give both "countries" a unique aircraft registration
number.
Therefore, China, Taiwan, Hong Kong and Macao all shared the same
aircraft registration, i.e. B-12345. B being the "country code"
like N is for US, 9V for singapore, etc etc.