Phonological opacity is well-studied and there are numerous proposals in the literature which analyze opacity in Optimality-Theoretic grammars. However. many analyses include significant elaborations to the basic architecture of Optimality Theory (Prince & Smolensky 1993/2004) or its serial alternative. Harmonic Serialism (McCarthy 2000). https://mabelandfoxs.shop/product-category/pop-up-tunnel/