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What is 1 + 3?
left gastric vein (portal)
azygous vein (caval)
superior rectal vein and inferior rectal vein (portal)
middle rectal veins and inferior rectal veins (caval)
paraumbilical veins (portal)
superficial epigastric vein (caval)
right colic vein, middle colic vein, left colic vein (portal)
renal vein, suprarenal vein, paravertebral vein, and gonadal vein (caval)
left branch of portal vein (portal)
inferior vena cava (caval)