Bisecting Rods Centered

Hello,

What is the equation of three bisecting solid rods centered at the origin?

Given 3 solid rods of length 3 and diameter 1.
One rod is on the x-axis
One rod is on the y-axis and
One rod is on the z-axis

Each is centered at the origin and is perpendicular to the other rods in each axis.

Need equation in rectangular coordinates.
Of the form F(x,y,z)=(??????)

Thanks for your help

TV

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