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An orthogonal polygon is called an ortho-unit polygon if its vertices haveinteger coordinates, and all of its edges have length one. In this paper weprove that any ortho-unit polygon with $n \geq 12$ vertices can be guarded withat most $\lfloor \frac{n-4}{8} \rfloor$ guards.

Ortho-unit polygons can be guarded with at most $\lfloor \frac{n-4}{8} \rfloor$ guards