(S (S (ADVP (RB Altogether)) (COMMA ,) (S (NP (BASENP (DT the) (NN four) (NNS sets)) (PP (IN of) (BASENP (NNS arrays)))) (VP (MD can) (VP (VB generate) (NP (NP (NP (QP (BASENP (NN 84)) (PP (TO to) (BASENP (NN 120)))) (NNS kilowatts)) (PP (IN of) (BASENP (NN electricity)))) (COLON --) (ADJP (JJ enough) (S (VP (TO to) (VP (VP (VB provide) (BASENP (NN power))) (PP (IN for) (NP (QP (ADVP (RBR more) (IN than)) (NN 40)) (BASENP (JJ average) (NNS homes))))))))))))) (PERIOD .))