How can I detect when a player enters a specific area and run a command only once in Minecraft Java Edition?

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I’m building an adventure map in Minecraft Java Edition and want to trigger an event when a player enters a specific room. The room covers the coordinates 120 64 -35 to 132 70 -22. When a player enters this area, I need to: Display a title saying “You entered the vault”. Give the player a temporary Speed effect. Summon several hostile mobs. Prevent the commands from running repeatedly while the player remains inside the room.

How can I detect when a player enters a specific area and run a command only once in Minecraft Java Edition?

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