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Dota 2 Keys X3,
Half-life 2
Half-life 2:episode 1
This is a long shot, but since no-one else has commented I might as well try, 8x Dota 2 for Half-Life 2: Episode 1??
Edit: And yes I see that you have Dota 2 copies to trade yourself too but still worth a try
Dota 2 Keys X3,
Half-life 2
Half-life 2:episode 1