Fold back the decision tree and state what strategy should be followed. 
Definitions:
Pulmonary Artery
The artery carrying deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.
Left Lung
The lung on the left side of the body, which is smaller than the right lung and consists of two lobes to accommodate the heart.
Umbilical Vein
The blood vessel in a developing embryo and fetus that carries oxygenated blood from the placenta to the growing baby.
Ligamentum Venosum
A fibrous remnant of the fetal ductus venosus that connects the left branch of the portal vein to the inferior vena cava.
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