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lang-tex
\ppath{File, ,,New,Document,}neither you get three triangles behind "File" but you get only one triangle, nor you get a triangle behind "Document".{}to have a blank item that is not discarded: with\ppath{File, {} ,{},New,Document,{}}you obtain as many triangles as there are commas.\clist_use:nn { #2 } { #1 }is even fully expandable.