( ( Fractional distillation ) ( ( ( is also ) ( used ( in ( ( ( ( ( ( air separation ) , ) ( producing ( liquid ( oxygen ( , ( liquid nitrogen ) ) ) ) ) ) , ) and ) ( ( highly concentrated ) argon ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Fractional) (NN distillation)) (VP (VBZ is) (ADVP (RB also)) (VP (VBN used) (PP (IN in) (NP (NP (NP (NN air) (NN separation)) (, ,) (NP (VBG producing) (JJ liquid) (NN oxygen) (, ,) (JJ liquid) (NN nitrogen)) (, ,)) (CC and) (NP (ADJP (RB highly) (VBN concentrated)) (NNP argon)))))) (. .)))
Fractional distillation is also used in air separation, producing liquid oxygen, liquid nitrogen, and highly concentrated argon.
(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)))))))) (. .)))