plywood with x's

The flooring guys laid down some subfloor plywood that all these x's on it. Is this to tell them where to staple? Just curious.
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Are they in a grind about 4x4 inches. If so, that shows where they have to nail it to the subfloor below it.
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wrote:

Hoo, haa--good one!
--JWW
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They were playing TIC-TAC-TOE at the plywood factory. look for another sheet with o's on it.
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