(S (S (BASENP (NNP BBC) (NNP News)) (VP (VBZ says) (SBAR (S (BASENP (DT the) (NN letter)) (VP (VBZ states) (SBAR (WHNP (WP what)) (S (S (VP (MD would) (VP (VB be) (VP (VBD needed))))) (SBAR (IN if) (S (BASENP (NNP Iran)) (VP (VBD was) (ADJP (JJ willing) (S (VP (TO to) (VP (VB continue) (NP (BASENP (DT any) (NN battle)) (PP (IN with) (NP (BASENP (DT the) (NN country)) (PP (IN of) (BASENP (NNP Iraq)))))))))))))))))))) (PERIOD .))