( ( For example ) ( , ( ( consider ( ( a piece ) ( of ( ( firewood ( -LRB- ( ( ( a form ) ( of ( condensed ( solar energy ) ) ) ) -RRB- ) ) ) ( for ( a ( wood-burning stove ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (VP (VB consider) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NP (NP (NN firewood)) (PRN (-LRB- -LRB-) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (JJ condensed) (JJ solar) (NN energy)))) (-RRB- -RRB-))) (PP (IN for) (NP (DT a) (JJ wood-burning) (NN stove))))))) (. .)))
For example, consider a piece of firewood (a form of condensed solar energy) for a wood-burning stove.
(ROOT (S (NP (NNP Wood) (NNP burning)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (JJ different) (NN substance)) (VP (VBG being) (VP (VBN formed))))))) (. .)))