Obvious

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Steam Trading Cards Group - Public
2,224,512 Members   |   55,129 In-Game   |   417,501 Online   |   209176 In Group Chat
Steam Universe - Public
1,791,884 Members   |   51,416 In-Game   |   372,725 Online   |   42084 In Group Chat
Achievement Acquisition Squad (AAS)
579 Members   |   55 In-Game   |   232 Online   |   110 In Group Chat