Visa tourist L 2 entries

Hi,

I have a question regarding two entries tourism visa type L (2 entries with a maximum of 30 days duration stay).
On my first entry. I will fly to Beijing, then by train to Xian, Shanghai and so on up to Shenzhen. I will exit China mainland at Shenzhen.(Luohu Custom :I have already been to Shenzhen) to get to Hong Kong. from there I will go back to Shenzhen using my second entry

On my second entry : I will get to Shenzhen from Hong Kong (Luohu Custom) and will fly back to Bangkok from Kunming two weeks later.

I am able to justify my hotels and so on. I will have my inbound ticket to Beijing (first entry) and my outbound ticket from Kunming to Bangkok (second entry).

Now my question : How to justify my exit from China ( first Visa entry Shenzhen to Hong Kong) and my entry to China (second Visa entry Hong Kong to Shenzhen) when applying for the Visa double entry???