( ( For ( ( all compounds ) ( containing carbon ) ) ) ( , ( C ( ( is ( ( ( ( ( listed first ) , ) ( ( followed ( by H ) ) ( , ( ( if present ) , ) ) ) ) and ) ( them ( by ( ( remaining elements ) ( in ( alphabetical order ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (S (NP (DT all) (NNS compounds)) (VP (VBG containing) (NP (NN carbon))))) (, ,) (NP (NNP C)) (VP (VBZ is) (VP (VP (VBN listed) (ADVP (RB first))) (, ,) (VP (VBN followed) (PP (IN by) (NP (NNP H))) (PRN (, ,) (SBAR (IN if) (FRAG (ADJP (JJ present)))) (, ,))) (CC and) (VP (NP (PRP them)) (PP (IN by) (NP (NP (JJ remaining) (NNS elements)) (PP (IN in) (NP (JJ alphabetical) (NN order)))))))) (. .)))
For all compounds containing carbon, C is listed first, followed by H, if present, and them by remaining elements in alphabetical order.
(ROOT (S (NP (NP (NNS Compounds)) (VP (VBG containing) (NP (DT the) (NN element) (NN carbon)))) (VP (VBP are) (NP (NP (DT the) (NN basis)) (PP (IN of) (NP (DT all) (VBN known) (NN life))))) (. .)))
Compounds containing the element carbon are the basis of all known life.