(S (S (BASENP (NNP Singh)) (VP (VP (VP (VP (VBD underwent) (BASENP (DT a) (JJ coronary) (NN angiography))) (PP (IN at) (BASENP (DT the) (NNP AIIMS) (NN hospital)))) (PP (IN on) (BASENP (NNP Tuesday) (CC and) (NNP Wednesday)))) (CC and) (VP (VBD was) (VP (VBN discharged) (PP (IN on) (BASENP (NNP Thursday))))))) (PERIOD .))