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| Column $I$ | Column $II$ |
| $i$. Eustachian valve | $a$. Opening of pulmonary aorta |
| $ii$. Thebesian valve | $b$. Left atrioventricular aperture |
| $iii$. Mitral valve | $c$. Opening of inferior vena cava |
| $iv$. Semilunar valve | $d$. Opening of coronary sinus |
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