MAYBE
MAYBE
TRS:
 {
                    app(app(map(), f), nil()) -> nil(),
  app(app(map(), f), app(app(cons(), x), xs)) ->
  app(app(cons(), app(f, x)), app(app(map(), f), xs)),
             app(app(plus(), app(s(), x)), y) ->
  app(s(), app(app(plus(), x), y)),
                     app(app(plus(), 0()), x) -> 0(),
          app(sum(), app(app(cons(), x), xs)) ->
  app(app(plus(), x), app(sum(), xs)),
         app(size(), app(app(node(), x), xs)) ->
  app(s(), app(sum(), app(app(map(), size()), xs)))
 }
 DUP: We consider a duplicating system.
  Trs:
   {
                      app(app(map(), f), nil()) -> nil(),
    app(app(map(), f), app(app(cons(), x), xs)) ->
    app(app(cons(), app(f, x)), app(app(map(), f), xs)),
               app(app(plus(), app(s(), x)), y) ->
    app(s(), app(app(plus(), x), y)),
                       app(app(plus(), 0()), x) -> 0(),
            app(sum(), app(app(cons(), x), xs)) ->
    app(app(plus(), x), app(sum(), xs)),
           app(size(), app(app(node(), x), xs)) ->
    app(s(), app(sum(), app(app(map(), size()), xs)))
   }
  Fail