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How to add requirements to the token contract: 1) owner has enough tokens and 2) minimum sum...

Some suggestions: Don't write 200000000000000. It makes the number unreadable. Instead, you can just write 2 ether: if (getEthBalance(addresses[i]) <= 2 ether) { Why do you have a getEthBalance f …
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Why using assert, since it would consume all gas

If you want to punish the naughty users who supply bad arguments to your functions, you should use up all their gas :-)
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