diff --git a/Step-2%3A-Player%2C--Movement%2C-and-Collision.md b/Step-2a%3A-Player%2C--Movement%2C-and-Collision.md
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rename from Step-2%3A-Player%2C--Movement%2C-and-Collision.md
rename to Step-2a%3A-Player%2C--Movement%2C-and-Collision.md