Upon commencement of commercial operation of each new utility unit under subpart 1 of part B, the unit shall comply with the requirements of subsection (a)(1).
( ( Upon ( commencement ( of ( ( commercial operation ) ( of ( ( each ( new ( utility unit ) ) ) ( under ( ( subpart 1 ) ( of ( part B ) ) ) ) ) ) ) ) ) ) ( , ( ( the unit ) ( ( shall ( comply ( with ( ( the requirements ) ( of ( ( subsection ( -LRB- ( a -RRB- ) ) ) ( -LRB- ( 1 -RRB- ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Upon) (NP (NP (NN commencement)) (PP (IN of) (NP (NP (JJ commercial) (NN operation)) (PP (IN of) (NP (NP (DT each) (JJ new) (NN utility) (NN unit)) (PP (IN under) (NP (NP (NN subpart) (CD 1)) (PP (IN of) (NP (NN part) (NN B))))))))))) (, ,) (NP (DT the) (NN unit)) (VP (MD shall) (VP (VB comply) (PP (IN with) (NP (NP (DT the) (NNS requirements)) (PP (IN of) (NP (NP (NP (NN subsection)) (PRN (-LRB- -LRB-) (X (SYM a)) (-RRB- -RRB-))) (PRN (-LRB- -LRB-) (NP (CD 1)) (-RRB- -RRB-)))))))) (. .)))
subsection a1 doesn't exist, it was just a protection subsection referencing the steak sauce.
( ( ( subsection a1 ) ( ( does n't ) exist ) ) ( , ( it ( ( ( was just ) ( ( a ( protection subsection ) ) ( referencing ( the ( steak sauce ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (NN subsection) (NNS a1)) (VP (VBZ does) (RB n't) (VP (VB exist)))) (, ,) (NP (PRP it)) (VP (VBD was) (ADVP (RB just)) (NP (NP (DT a) (NN protection) (NN subsection)) (VP (VBG referencing) (NP (DT the) (NN steak) (NN sauce))))) (. .)))