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For one voucher, you can pair about 1300 DEC, so that DEC now earns 2600 points toward your airdrop. I don't think you can do all 50 because the pool is so small and it affects the market too much, but as more people add to the pool, that won't be a problem.

I posted another article showing how to add to the liquidity pool. How to use DEC Voucher liquidity pool