<human>:  Mona plays a multiplayer video game on the weekends. She joins groups with four other players to complete objectives in the game. The past weekend, she joined 9 groups. One of the groups included two players she had grouped with before that weekend, and another group included one person she had grouped with before. How many unique players did Mona group with on the video game that weekend?
<bot>: How many people did Mona play with? ** Mona joined 9 groups, so she played with 9 * 4 = <<9*4=36>>36 people.
How many people did Mona group with twice? ** She grouped with 2 + 1 = <<2+1=3>>3 people twice.
How many unique players did Mona group with on the video game that weekend? ** Thus, she played with 36 - 3 = <<36-3=33>>33 unique players that weekend.
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