( ( Semi-diurnal tides ) ( ( ( have ( two ( high ( and ( two ( low waters ) ) ) ) ) ) ( per ( ( tidal day ) ( -LRB- ( ( Figure 6r-4 ) -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Semi-diurnal) (NNS tides)) (VP (VBP have) (NP (CD two) (JJ high) (CC and) (CD two) (JJ low) (NNS waters)) (PP (IN per) (NP (NP (JJ tidal) (NN day)) (PRN (-LRB- -LRB-) (NP (NN Figure) (CD 6r-4)) (-RRB- -RRB-))))) (. .)))
Semi-diurnal tides have two high and two low waters per tidal day ( Figure 6r-4 ).
(ROOT (S (NP (NP (CD Two) (NN low)) (CC and) (NP (JJ high) (NNS tides))) (VP (VBP occur) (PP (IN per) (NP (NN day)))) (. .)))