往還の衛とはどう言う意味ですか？ 辞書で調べても出てこなくて分かりません。
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a/3<=1<=4a/3とありますが4a... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810404/thumb_l_webp_70236300-B387-4A8D-A246-76C58E626EEE.webp?Expires=1787701535&Signature=FGyd9RPmnMqbVj7qHdfgwRmWGrEcdEf4BznE7W3Q5VQtD6VGxtFEeETI0rLvVaoYL~pLAPtLr3c-etFUet7C-C0-GNyKLGNTN2VPI3MNVrMXtWy4pE97~FcMtPrwRvJk0O738RjllF2GTu5F6J6YehFhRaQf6M1wJB6MX8teht3pWxSKFGOOhcvC4~1q15GxmY~acKPpw4Z~nqIbRhQCpAufpMxGR5rpqHkEbNlfvS2YuqD7dmBBfWpLt3OgwQjkGOTHsY1kKMXk461droAclCpOAIxXor~q~2GNbglP1ns1HbEVGn8QPsbx3wQyhkKKAKIUC5tRoaMPg7aTkjjceg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787701535&Signature=to1EqcAgLU5rCoMVRGuNubwvDy9WTjfGbHV~hn5Xr8Ff5GEQjZ3-IE7xn4pZgLm3DjQaZZP721ohgxSSQVhXLAxd3ZwsfnTMzCHGQQZwFXx~j6j8mLRYzqD7xtyGA8aHCpB-9nw16Acp1llRvbOmZjK0XpfXFTHbJzTXQOgaUVZ7tqUUuDA9iQZbt2GsT5k~U69SAD91tQlZDHgCBC13el~YnYHAPtt7a8BbaKdzXfKattRilFgWi-TAfgIiq1DsZM8u3JogzlUHx9FV5BSeOPBt18vTiqYATatuV1uGxErO9J17BBkREz9wloQ3Vj~-n6WJ0JrpDRfb4LO9LkMj0Q__&Key-Pair-Id=K2W722D70GJS8W)
