(S (S (NP (BASENP (DT The) (NN five) (NNS teams)) (PP (IN in) (NP (BASENP (DT each)) (PP (IN of) (BASENP (NN two) (NNS groups)))))) (VP (VP (VBP play) (BASENP (DT each) (NN other))) (ADVP (RB once)))) (PERIOD .))