( ( ( Cryogenic ( air ( separation units ) ) ) ( -LRB- ( ASUs -RRB- ) ) ) ( ( are ( built ( to ( ( ( provide ( ( nitrogen or ) oxygen ) ) and ) ( often ( co-produce argon ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Cryogenic) (NN air) (NN separation) (NNS units)) (PRN (-LRB- -LRB-) (NP (NNP ASUs)) (-RRB- -RRB-))) (VP (VBP are) (VP (VBN built) (S (VP (TO to) (VP (VP (VB provide) (NP (NN nitrogen) (CC or) (NN oxygen))) (CC and) (VP (ADVP (RB often)) (VB co-produce) (NP (NNP argon)))))))) (. .)))
Cryogenic air separation units (ASUs) are built to provide nitrogen or oxygen and often co-produce 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)))))))) (. .)))