A group of people are standing behind a wooden fence, while a man in a light blue shirt stands on the other side.
A group of people are standing on one side of a fence while a man stands alone on the other side outdoors.
If people stand on one side of the fence, that means they are behind it from some viewpoints. Man, a singular noun, indicates he is alone. The man is on the other side of a fence which implies he is outdoors.
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