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220w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" \/> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blog.city-niigata.ed.jp\/marusyo300\/wp-content\/uploads\/2026\/05\/IMG_3692.jpg\" alt=\"\" width=\"480\" height=\"360\" class=\"size-full wp-image-4251 aligncenter\" srcset=\"https:\/\/blog.city-niigata.ed.jp\/marusyo300\/wp-content\/uploads\/2026\/05\/IMG_3692.jpg 480w, https:\/\/blog.city-niigata.ed.jp\/marusyo300\/wp-content\/uploads\/2026\/05\/IMG_3692-300x225.jpg 300w, https:\/\/blog.city-niigata.ed.jp\/marusyo300\/wp-content\/uploads\/2026\/05\/IMG_3692-220x165.jpg 220w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" 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