Check if area contains only one entity in Minecraft with a command block

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How do I find a certain entity in Minecraft?

The @e selector finds entities of any type. The c= argument selects a certain count. If this number is positive, it will select these in order from closest to furthest. c=1 will select the nearest entity.

How do you target a single entity in Minecraft?

Bedrock Edition can use @r to target non-player entities via the type selector argument; in Java Edition, to select a random entity, use @e[sort=random] instead. In Bedrock Edition, @r can only target entities who are alive.

Is there a command to find a specific block in Minecraft?

The reason I want this in the game is that, say, you have a lost structure in your world with a particular type of block that is not naturrally generated, you could use the command: /locateblock ____. The blank is for the particular block you are looking for.

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Minecraft: Entity 303 in only one command! (1.8)

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