( ( Once ( ( the ( `` ( sternal ( notch '' ) ) ) ) ( is located ) ) ) ( , ( ( ( measure ( a ( vertical line ) ) ) ( from ( ( the base ) ( of ( ( the ( sternal notch ) ) ( to ( ( the base ) ( of ( ( the ( pubic symphsysis ) ) ( referenced ( by ( ( ( placing ( ( a ( book ( or ( suitable object ) ) ) ) ( in ( the ( crotch area ) ) ) ) ) and ) ( exerting ( a ( slight ( upward force ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (SBAR (IN Once) (S (NP (DT the) (`` ``) (JJ sternal) (NN notch) ('' '')) (VP (VBZ is) (VP (VBN located))))) (, ,) (VP (VB measure) (NP (DT a) (JJ vertical) (NN line)) (PP (IN from) (NP (NP (DT the) (NN base)) (PP (IN of) (NP (NP (DT the) (JJ sternal) (NN notch)) (PP (TO to) (NP (NP (DT the) (NN base)) (PP (IN of) (NP (NP (DT the) (JJ pubic) (NNS symphsysis)) (VP (VBN referenced) (PP (IN by) (S (VP (VP (VBG placing) (NP (NP (DT a) (NN book) (CC or) (JJ suitable) (NN object)) (PP (IN in) (NP (DT the) (JJ crotch) (NN area))))) (CC and) (VP (VBG exerting) (NP (DT a) (JJ slight) (JJ upward) (NN force)))))))))))))))) (. .)))
Once the &quot;sternal notch&quot; is located, measure a vertical line from the base of the sternal notch to the base of the pubic symphsysis referenced by placing a book or suitable object in the crotch area and exerting a slight upward force .
(ROOT (S (NP (JJ Bouyant) (NN force)) (VP (VBZ is) (NP (NP (DT the) (JJ upward) (NN force)) (VP (VBN exerted) (PP (IN by) (NP (NP (NNS fluids)) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT any) (NN object)) (, ,) (PP (JJ such) (IN as) (NP (DT a) (NN boat))) (, ,)) (VP (VBZ is) (VP (VBN placed) (PP (IN in) (NP (PRP it)))))))))))) (. .)))