( ( ( a ( slender piece ) ) ( of ( ( ( ( ( wood , ) cardboard ) , ) or ) ( other ( flammable material ) ) ) ) ) ( ( tipped ( with ( ( a ( chemical substance ) ) ( that ( ( produces fire ) ( when ( rubbed ( on ( a ( ( ( rough or ) ( chemically prepared ) ) surface ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT a) (NN slender) (NN piece)) (PP (IN of) (NP (NP (NN wood)) (, ,) (NP (NN cardboard)) (, ,) (CC or) (NP (JJ other) (JJ flammable) (NN material))))) (VP (VBD tipped) (PP (IN with) (NP (NP (DT a) (JJ chemical) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ produces) (NP (NN fire)) (SBAR (WHADVP (WRB when)) (S (VP (VBD rubbed) (PP (IN on) (NP (DT a) (ADJP (ADJP (JJ rough)) (CC or) (ADJP (ADVP (RB chemically)) (VBN prepared))) (NN surface)))))))))))) (. .)))
a slender piece of wood, cardboard, or other flammable material tipped with a chemical substance that produces fire when rubbed on a rough or chemically prepared surface.
(ROOT (S (NP (NP (DT The) (NN action)) (PP (IN of) (S (VP (VBG burning) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NN wood)))))))) (VP (VBZ forms) (NP (DT a) (JJ different) (NN chemical) (NN substance))) (. .)))