MAYBE
MAYBE
TRS:
 {
  app(app(F(), app(app(F(), f), x)), x) ->
  app(app(F(), app(G(), app(app(F(), f), x))), app(f, x))
 }
 DUP: We consider a duplicating system.
  Trs:
   {
    app(app(F(), app(app(F(), f), x)), x) ->
    app(app(F(), app(G(), app(app(F(), f), x))), app(f, x))
   }
  Fail