sentence1_binary_parse: ( Coal ( ( is ( ( ( mined and ) burned ) ( to ( produce ( heat energy ) ) ) ) ) . ) )
sentence1_parse: (ROOT (S (NP (NNP Coal)) (VP (VBZ is) (VP (VBN mined) (CC and) (VBN burned) (S (VP (TO to) (VP (VB produce) (NP (NN heat) (NN energy))))))) (. .)))
sentence1: Coal is mined and burned to produce heat energy.
sentence2_parse: (ROOT (S (NP (NNP Heat)) (VP (VBZ is) (VP (VBN produced) (SBAR (WHADVP (WRB when)) (S (NP (NN paper)) (VP (VBZ is) (VP (VBN burned))))))) (. .)))
sentence2: Heat is produced when paper is burned.