constructed around a core of flimsy -- or , worse yet , nonexistent -- ideas 
(ROOT (VP (VBN constructed) (PP (IN around) (NP (NP (DT a) (NN core)) (PP (IN of) (NP (ADJP (ADJP (JJ flimsy)) (, --) (CC or) (, ,) (ADVP (JJR worse) (RB yet)) (, ,) (ADJP (JJ nonexistent)) (, --)) (NNS ideas)))))))
(ROOT (VP (VBN ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (ADJP (ADJP (JJ )) (, ) (CC ) (, ) (ADVP (JJR ) (RB )) (, ) (ADJP (JJ )) (, )) (NNS )))))))