(S (S (NP (BASENP (JJ Irish) (JJ low) (NNS fares) (NN airline)) (PRN (COMMA ,) (BASENP (NNP Ryanair)) (COMMA ,))) (VP (BASENP (DT this) (NN week)) (VP (VBD celebrated) (BASENP (PRPD its) (JJ 20th) (NN birthday))))) (PERIOD .))