(S (S (BASENP (PRP They)) (VP (ADVP (RB also)) (VP (VBD installed) (NP (BASENP (DT a) (JJ commercial) (NN robotics) (NN experiment)) (CC and) (NP (BASENP (DT a) (JJ biological) (NN experiment)) (PP (IN on) (NP (BASENP (DT the) (NN exterior)) (PP (IN of) (BASENP (DT the) (NNP Zvezda) (NNP Service) (NNP Module)))))))))) (PERIOD .))