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=                        Instruction                           =
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1) Deploy
2) setWallet(wallet address)
3) setStart(presale GMT start date in UNIX format)
4) setHardcap(max limit of invested ether in wei)
5) setMin(min ether for single purchase in wei)
6) setPeriod(presale period in days)

explanations:
1 eth = 1000000000000000000 wei
GMT = Moscow time - 3 hours
You can convert GMT date to UNIX format http://www.onlineconversion.com/unix_time.htm  

During ICO:
You should set presale contract address to ICO contract.
When investor purchase ICO contract should call balanceOf(invesot address) from presale contract.

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=                        Demo in Kovan                         =
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1) Deployed from 0xb8600b335332724Df5108Fc0595002409c2ADbC6 

https://kovan.etherscan.io/address/0x65c5afbba7758a966980a623f750bed5e3a51372#readContract

2) setWallet(0xE619BCD3c4609AE269B5eBE5bf0cb7D1Dc70C210)
3) setStart(1505912400)   -  Wed, 20 Sep 2017 13:00:00 GMT
4) setHardcap(100000000000000000000) - 100 ETH
5) setMin(50000000000000000) - 0.05 ETH
6) setPeriod(30) - 30 days

During pre sale invested:
0x54a67F1507dEb1BFc58ba3ffa94B59fC50EB74BC - 0.1
0x54a67F1507dEb1BFc58ba3ffa94B59fC50EB74BC - 0.3
0xD1BC33B2c89C93E65b0D476B8b50BFee82594847 - 0.1

Summary invested - 0.5 you can see in 0xE619BCD3c4609AE269B5eBE5bf0cb7D1Dc70C210
Total investors 2
balancOf(0x54a67F1507dEb1BFc58ba3ffa94B59fC50EB74BC) - 400000000000000000 or 0.4 ETH
balancOf(0xD1BC33B2c89C93E65b0D476B8b50BFee82594847) - 100000000000000000 or 0.1 ETH

Test successfully finished.