(S (S (S (BASENP (NN Uranium) (NN hexafluoride)) (VP (VP (VP (MD can) (RB not)) (VP (BASENP (PRP itself)) (VP (VB be) (VP (VBN used) (PP (IN in) (BASENP (DT a) (JJ nuclear) (NN weapon))))))) (CONJP (COMMA ,) (CC but)) (VP (MD can) (VP (VB be) (VP (VBN enriched) (PP (IN into) (BASENP (JJ weapons-grade) (NN uranium)))))))) (CONJP (COMMA ,) (CC or)) (S (BASENP (PRP it)) (VP (MD can) (VP (VB be) (VP (VP (VBN converted) (PP (IN into) (BASENP (NN plutonium)))) (PP (IN in) (BASENP (DT a) (JJ nuclear) (NN reactor)))))))) (PERIOD .))