( ( ( Do not ) ( combine ( with ( ( ( any hydrocarbon ) or ) ( volatile ( fuel compound ) ) ) ) ) ) . )
(ROOT (S (VP (VB Do) (RB not) (VP (VB combine) (PP (IN with) (NP (NP (DT any) (NN hydrocarbon)) (CC or) (NP (JJ volatile) (NN fuel) (NN compound)))))) (. .)))
Do not combine with any hydrocarbon or volatile fuel compound.
(ROOT (S (NP (NP (JJ Hydrocarbons) (NNS compounds)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VP (VBP serve) (PP (IN as) (NP (NNS fuels)))) (CC and) (VP (VBP are) (VP (VBN used) (PP (IN in) (NP (NN manufacturing)))))))) (, ,)) (VP (VBP are) (VP (VBN called) (NP (NP (DT the) (VBG driving) (NN force)) (PP (IN of) (NP (JJ western) (NN civilization)))))) (. .)))