(S (S (PP (IN In) (BASENP (NNP Mauritania))) (S (PRN (COMMA ,) (PP (IN for) (BASENP (NN example))) (COMMA ,)) (S (S (NP (BASENP (DT a) (NN staple) (NN food)) (PP (IN such) (PP (IN as) (BASENP (NN wheat))))) (VP (ADVP (RB still)) (VP (VBZ costs) (NP (BASENP (QP (RB over) (NN 600)) (NN USD)) (PP (IN per) (BASENP (NN tonne))))))) (COMMA ,) (SBAR (IN whereas) (S (PP (IN in) (BASENP (DT the) (NNP United) (NNPS States))) (S (BASENP (DT the) (NN price)) (VP (VBZ has) (VP (VBN fallen) (PP (IN below) (BASENP (NN 300) (NN USD))))))))))) (PERIOD .))