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Its simple, it requires two nouns that together describe something.
Order does not mater so long as the combination of the two nouns has meaning.
Here is an example
WOOD FENCE
The next post could or would be ---
WOOD POLE or
FENCE POST or
WOOD CHIP or
FENCE WIRE or
and so on.
So--- As long as only one of the previous nouns (wood or fence) were used for the next post there is no order and there should be two nouns used per post.