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Hi,
Bitcoincafe.ch is organizing a contest with 4 Ledger Wallet Nano S to win.
Here is the contest page: https://www.bitcoincafe.ch/2017/03/27/win-a-ledger-wallet-ledger-nano-s-cryptocurrency-hardware/
There is 18 ways to enter, there is nothing to buy to participate in this contest, you can simply participate by visiting a page only.
Good Luck !