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You can't trade the games from your library. Once they are activated they stay on your account forever.
Anything from here for Oxygen not included?
https://www.steamtrades.com/trade/OW1cj/trading-steam-gift-keys-for-more-games-or-paypal-june-monthly-bundle-sherlock-superhot-etc
castle story,oxygen not included,killing floor,death road to canada
prison architect,war for the overworld,many land.