And then use "Estimate Equation" from the "Quick" option
, typing "y c x2 x3 x4" into the dialog box.
And here are the results:

And then click the "Coefficient Tests" from the "View" buttom.
Choose "Omitted Variable ----- likelihood ratio" like this:

And then Enter "x5 x6" into the dialog box and the F-statistics will be displayed like this:

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