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Jan 12, 2017 at 20:51 comment added John So something similar to how we treat propane bottles but in reverse, you can swap the bottles for free but people pay for the propane (magic), only the first bottle cost you any money and after that you get paid to exchange full bottles for empty ones. You should include some easy way to tell how charged they are.
Apr 13, 2016 at 16:32 vote accept Babika Babaka
Apr 12, 2016 at 21:09 history answered Henry Taylor CC BY-SA 3.0