xtabond2 exp  l.exp sd import ofdi fdi,gmm(exp sd import ofdi fdi,lag(1 1)) iv(h open) small noc
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Favoring speed over space. To switch, type or click on mata: mata set matafavor space, perm.
unknown egen function max()
                 stata():  3598  Stata returned error
         xtabond2_mata():     -  function returned error
                 <istmt>:     -  function returned error