(1) -> L ==> List OutputForm;

rsl: List L := [[x1::OutputForm],[x2::OutputForm],[],[]];

sl: L := [commaSeparate(z)$OutputForm for z in rsl];

of: OutputForm := scripts(v::OutputForm, sl)$OutputForm;

tex(of)

   There are no exposed library operations named tex but there is one 
      unexposed operation with that name. Use HyperDoc Browse or issue
                               )display op tex
      to learn more about the available operation.

   Cannot find a definition or applicable library operation named tex 
      with argument type(s) 
                                 OutputForm

      Perhaps you should use "@" to indicate the required return type, 
      or "$" to specify which version of the function you need.