( ( Most bulbs ) ( ( contain ( ( ( ( ( ( ( a mixture ) ( of gases ) ) , ) ( ( ( commonly argon ) and ) nitrogen ) ) , ) ( instead of ) ) air ) ) . ) )
(ROOT (S (NP (JJS Most) (NNS bulbs)) (VP (VBP contain) (NP (NP (NP (DT a) (NN mixture)) (PP (IN of) (NP (NNS gases)))) (, ,) (NP (NP (NNP commonly) (NNP argon)) (CC and) (NP (NN nitrogen))) (, ,) (CONJP (RB instead) (IN of)) (NP (NN air)))) (. .)))
Most bulbs contain a mixture of gases, commonly argon and nitrogen, instead of air.
(ROOT (S (NP (NNP Nitrogen) (, ,) (NNP oxygen) (CC and) (NNP argon)) (VP (VBP are) (NP (NP (DT the) (CD three) (JJS most) (JJ common) (NNS elements)) (PP (IN in) (NP (NP (DT the) (NN air)) (SBAR (S (NP (PRP we)) (VP (VB breathe)))))))) (. .)))