(S (S (NP (BASENP (DT The) (NN purpose)) (PP (IN of) (BASENP (PDT such) (DT a) (NN conversion) (NN process)))) (VP (VP (VBZ is) (ADVP (RB usually))) (NP (BASENP (DT an) (JJ intermediate) (NN step)) (PP (IN in) (NP (BASENP (DT the) (NN production)) (PP (IN of) (BASENP (JJ nuclear) (NN fuel)))))))) (PERIOD .))