/* ──────────────────────────────────────────
   LECTURES DATA  — 엑셀 4차년도_결과물_목록 기반
   구조: 10개 강좌 × 8차시 × N개 클립 (총 453개)
   courses[i].sessions[j].clips[k].url = 실제 mp4 URL
────────────────────────────────────────── */
const LECTURES = [
  {
    "folder": 1,
    "name": "한국과 일본의 언어와 문화",
    "thumbnail": "https://video.cloverpictures.synology.me/year4/thumbnails/1강.png",
    "sessions": [
      {
        "session": "1주차",
        "label": "한국과 일본의 언어와 문화 — 1주차",
        "group": "1-1",
        "clips": [
          {
            "file": "1-1-1",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-1-1.mp4"
          },
          {
            "file": "1-1-2",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-1-2.mp4"
          },
          {
            "file": "1-1-3",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-1-3.mp4"
          },
          {
            "file": "1-1-4",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-1-4.mp4"
          },
          {
            "file": "1-1-5",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-1-5.mp4"
          },
          {
            "file": "1-1-6",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-1-6.mp4"
          }
        ]
      },
      {
        "session": "2주차",
        "label": "한국과 일본의 언어와 문화 — 2주차",
        "group": "1-2",
        "clips": [
          {
            "file": "1-2-1",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-1.mp4"
          },
          {
            "file": "1-2-2",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-2.mp4"
          },
          {
            "file": "1-2-3",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-3.mp4"
          },
          {
            "file": "1-2-4",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-4.mp4"
          },
          {
            "file": "1-2-5",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-5.mp4"
          },
          {
            "file": "1-2-6",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-6.mp4"
          },
          {
            "file": "1-2-7",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-7.mp4"
          },
          {
            "file": "1-2-8",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-8.mp4"
          },
          {
            "file": "1-2-9",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-9.mp4"
          },
          {
            "file": "1-2-10",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-10.mp4"
          },
          {
            "file": "1-2-11",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-2-11.mp4"
          }
        ]
      },
      {
        "session": "3주차",
        "label": "한국과 일본의 언어와 문화 — 3주차",
        "group": "1-3",
        "clips": [
          {
            "file": "1-3-1",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-3-1.mp4"
          },
          {
            "file": "1-3-2",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-3-2.mp4"
          },
          {
            "file": "1-3-3",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-3-3.mp4"
          },
          {
            "file": "1-3-4",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-3-4.mp4"
          },
          {
            "file": "1-3-5",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-3-5.mp4"
          }
        ]
      },
      {
        "session": "4주차",
        "label": "한국과 일본의 언어와 문화 — 4주차",
        "group": "1-4",
        "clips": [
          {
            "file": "1-4-1",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-4-1.mp4"
          },
          {
            "file": "1-4-2",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-4-2.mp4"
          },
          {
            "file": "1-4-3",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-4-3.mp4"
          },
          {
            "file": "1-4-4",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-4-4.mp4"
          },
          {
            "file": "1-4-5",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-4-5.mp4"
          },
          {
            "file": "1-4-6",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-4-6.mp4"
          }
        ]
      },
      {
        "session": "5주차",
        "label": "한국과 일본의 언어와 문화 — 5주차",
        "group": "1-5",
        "clips": [
          {
            "file": "1-5-1",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-5-1.mp4"
          },
          {
            "file": "1-5-2",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-5-2.mp4"
          },
          {
            "file": "1-5-3",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-5-3.mp4"
          },
          {
            "file": "1-5-4",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-5-4.mp4"
          },
          {
            "file": "1-5-5",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-5-5.mp4"
          }
        ]
      },
      {
        "session": "6주차",
        "label": "한국과 일본의 언어와 문화 — 6주차",
        "group": "1-6",
        "clips": [
          {
            "file": "1-6-1",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-6-1.mp4"
          },
          {
            "file": "1-6-2",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-6-2.mp4"
          },
          {
            "file": "1-6-3",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-6-3.mp4"
          },
          {
            "file": "1-6-4",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-6-4.mp4"
          }
        ]
      },
      {
        "session": "7주차",
        "label": "한국과 일본의 언어와 문화 — 7주차",
        "group": "1-7",
        "clips": [
          {
            "file": "1-7-1",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-7-1.mp4"
          },
          {
            "file": "1-7-2",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-7-2.mp4"
          },
          {
            "file": "1-7-3",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-7-3.mp4"
          },
          {
            "file": "1-7-4",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-7-4.mp4"
          },
          {
            "file": "1-7-5",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-7-5.mp4"
          }
        ]
      },
      {
        "session": "8주차",
        "label": "한국과 일본의 언어와 문화 — 8주차",
        "group": "1-8",
        "clips": [
          {
            "file": "1-8-1",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-8-1.mp4"
          },
          {
            "file": "1-8-2",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-8-2.mp4"
          },
          {
            "file": "1-8-3",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-8-3.mp4"
          },
          {
            "file": "1-8-4",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-8-4.mp4"
          },
          {
            "file": "1-8-5",
            "url": "https://video.cloverpictures.synology.me/year4/1/1-8-5.mp4"
          }
        ]
      }
    ]
  },
  {
    "folder": 2,
    "name": "동아시아와 한국의 문자",
    "thumbnail": "https://video.cloverpictures.synology.me/year4/thumbnails/2강.png",
    "sessions": [
      {
        "session": "1주차",
        "label": "동아시아와 한국의 문자 — 1주차",
        "group": "2-1",
        "clips": [
          {
            "file": "2-1-1",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-1-1.mp4"
          },
          {
            "file": "2-1-2",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-1-2.mp4"
          },
          {
            "file": "2-1-3",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-1-3.mp4"
          },
          {
            "file": "2-1-4",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-1-4.mp4"
          },
          {
            "file": "2-1-5",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-1-5.mp4"
          },
          {
            "file": "2-1-6",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-1-6.mp4"
          }
        ]
      },
      {
        "session": "2주차",
        "label": "동아시아와 한국의 문자 — 2주차",
        "group": "2-2",
        "clips": [
          {
            "file": "2-2-1",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-2-1.mp4"
          },
          {
            "file": "2-2-2",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-2-2.mp4"
          },
          {
            "file": "2-2-3",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-2-3.mp4"
          },
          {
            "file": "2-2-4",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-2-4.mp4"
          },
          {
            "file": "2-2-5",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-2-5.mp4"
          },
          {
            "file": "2-2-6",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-2-6.mp4"
          },
          {
            "file": "2-2-7",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-2-7.mp4"
          }
        ]
      },
      {
        "session": "3주차",
        "label": "동아시아와 한국의 문자 — 3주차",
        "group": "2-3",
        "clips": [
          {
            "file": "2-3-1",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-3-1.mp4"
          },
          {
            "file": "2-3-2",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-3-2.mp4"
          },
          {
            "file": "2-3-3",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-3-3.mp4"
          },
          {
            "file": "2-3-4",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-3-4.mp4"
          },
          {
            "file": "2-3-5",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-3-5.mp4"
          },
          {
            "file": "2-3-6",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-3-6.mp4"
          },
          {
            "file": "2-3-7",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-3-7.mp4"
          }
        ]
      },
      {
        "session": "4주차",
        "label": "동아시아와 한국의 문자 — 4주차",
        "group": "2-4",
        "clips": [
          {
            "file": "2-4-1",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-4-1.mp4"
          },
          {
            "file": "2-4-2",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-4-2.mp4"
          },
          {
            "file": "2-4-3",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-4-3.mp4"
          },
          {
            "file": "2-4-4",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-4-4.mp4"
          },
          {
            "file": "2-4-5",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-4-5.mp4"
          },
          {
            "file": "2-4-6",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-4-6.mp4"
          },
          {
            "file": "2-4-7",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-4-7.mp4"
          }
        ]
      },
      {
        "session": "5주차",
        "label": "동아시아와 한국의 문자 — 5주차",
        "group": "2-5",
        "clips": [
          {
            "file": "2-5-1",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-5-1.mp4"
          },
          {
            "file": "2-5-2",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-5-2.mp4"
          },
          {
            "file": "2-5-3",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-5-3.mp4"
          },
          {
            "file": "2-5-4",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-5-4.mp4"
          },
          {
            "file": "2-5-5",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-5-5.mp4"
          },
          {
            "file": "2-5-6",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-5-6.mp4"
          },
          {
            "file": "2-5-7",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-5-7.mp4"
          }
        ]
      },
      {
        "session": "6주차",
        "label": "동아시아와 한국의 문자 — 6주차",
        "group": "2-6",
        "clips": [
          {
            "file": "2-6-1",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-6-1.mp4"
          },
          {
            "file": "2-6-2",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-6-2.mp4"
          },
          {
            "file": "2-6-3",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-6-3.mp4"
          },
          {
            "file": "2-6-4",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-6-4.mp4"
          },
          {
            "file": "2-6-5",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-6-5.mp4"
          },
          {
            "file": "2-6-6",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-6-6.mp4"
          }
        ]
      },
      {
        "session": "7주차",
        "label": "동아시아와 한국의 문자 — 7주차",
        "group": "2-7",
        "clips": [
          {
            "file": "2-7-1",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-7-1.mp4"
          },
          {
            "file": "2-7-2",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-7-2.mp4"
          },
          {
            "file": "2-7-3",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-7-3.mp4"
          },
          {
            "file": "2-7-4",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-7-4.mp4"
          },
          {
            "file": "2-7-5",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-7-5.mp4"
          },
          {
            "file": "2-7-6",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-7-6.mp4"
          },
          {
            "file": "2-7-7",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-7-7.mp4"
          },
          {
            "file": "2-7-8",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-7-8.mp4"
          }
        ]
      },
      {
        "session": "8주차",
        "label": "동아시아와 한국의 문자 — 8주차",
        "group": "2-8",
        "clips": [
          {
            "file": "2-8-1",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-8-1.mp4"
          },
          {
            "file": "2-8-2",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-8-2.mp4"
          },
          {
            "file": "2-8-3",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-8-3.mp4"
          },
          {
            "file": "2-8-4",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-8-4.mp4"
          },
          {
            "file": "2-8-5",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-8-5.mp4"
          },
          {
            "file": "2-8-6",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-8-6.mp4"
          },
          {
            "file": "2-8-7",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-8-7.mp4"
          },
          {
            "file": "2-8-8",
            "url": "https://video.cloverpictures.synology.me/year4/2/2-8-8.mp4"
          }
        ]
      }
    ]
  },
  {
    "folder": 3,
    "name": "한국의 방언",
    "thumbnail": "https://video.cloverpictures.synology.me/year4/thumbnails/3강.png",
    "sessions": [
      {
        "session": "1주차",
        "label": "한국의 방언 — 1주차",
        "group": "3-1",
        "clips": [
          {
            "file": "3-1-1",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-1-1.mp4"
          },
          {
            "file": "3-1-2",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-1-2.mp4"
          },
          {
            "file": "3-1-3",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-1-3.mp4"
          },
          {
            "file": "3-1-4",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-1-4.mp4"
          },
          {
            "file": "3-1-5",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-1-5.mp4"
          },
          {
            "file": "3-1-6",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-1-6.mp4"
          }
        ]
      },
      {
        "session": "2주차",
        "label": "한국의 방언 — 2주차",
        "group": "3-2",
        "clips": [
          {
            "file": "3-2-1",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-2-1.mp4"
          },
          {
            "file": "3-2-2",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-2-2.mp4"
          },
          {
            "file": "3-2-3",
            "url": "https://video.cloverpictures.synology.me/year4/3/3-2-3.mp4"
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