Follow to:
15N88gCoJU2pHguHPqFNCapXKvke7UCzr3
Then:
1D9c6qLKRjxh7xbyv6MBUcBFJHDFeDQpsg
Then:
16U6zvTH3UKP8EHT6mPZod8C2FrS4oVyy5
If you keep sending 0.04, Bitcoin will keep re-using the same coin because it's the best fit for a send of 0.04. If you have two 0.04 coins and make several 0.04 sends, you would see that Bitcoin chooses between them randomly. If you have a mix of coins with no exact matches, it gets even more unpredictable.
Bitcoin offers no ability to choose the sending address.
Interesting. Would have been nice if I can select the address. Oh well. I guess for BitLottto, people will be able to figure out the total pool, and I'll just point to the transaction of payment as proof. I'm just glad it doesn't screw me up too much....