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    $\begingroup$ Do you need the positions or is something like anl /. a_Symbol :> f[a] /. f[List] :> List acceptable? $\endgroup$ Commented Dec 20, 2015 at 20:57
  • $\begingroup$ @march, I need to operate with leaves of large lists and associations, so positions are not a value in itself. Anyway, Replacement would qualifiy as a useful alternative. $\endgroup$ Commented Dec 20, 2015 at 21:05
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    $\begingroup$ Is this what you need? l = Map[f, anl, {-1}]; Most /@ Position[l, f]? $\endgroup$ Commented Dec 20, 2015 at 21:06
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    $\begingroup$ related: 99603 $\endgroup$ Commented Dec 20, 2015 at 21:08
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    $\begingroup$ @Kuba This one?: mathematica.stackexchange.com/questions/98170/… $\endgroup$ Commented Dec 21, 2015 at 1:15