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Hellen
a. xi | 2 3 4 5 6 7 8 fi | 1 3 5 8 5 4 2
b. CLASSES | 1,5 ─ 1,6 ─ 1,7 ─ 1,8 ─ 1,9 ─ 2,0 ─ 2,1 ─ 2,2 fi | 4 8 12 15 12 8 4
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