1️⃣ 2️⃣ 0️⃣ 3️⃣ 4️⃣ 5️⃣ 6️⃣ 7️⃣ 8️⃣xxxxx

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1247 ← → 1250

1248 AN Dominus in caelo alleluiaModus 6

1247 ⟽ AN 1 ⟾ 1446

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