Choose the correct sequence:
(1) Pulmonary vein → Pulmonary artery → Left auricle → Right ventricle
(2) Pulmonary artery → Right auricle → Left ventricle → Pulmonary vein
(3) Right auricle → Pulmonary artery → Pulmonary vein → Left ventricle
(4) Left ventricle → Pulmonary vein → Pulmonary artery → Right auricle