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Hint
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Answer
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1) Iron, Bronze, Ice
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Age
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2) Ptolemaic, Qing, Ming
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Dynasty
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3) Punic, Hundred Years, Roses
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War
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4) Hadrians, Berlin, China
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Wall
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5) Roman, Ottoman, Incan
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Empire
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6) Maginot, Mason-Dixon, East coast
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Line
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7) American, Industrial, Russian
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Revolution
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8) Umayyad, Rashidun, Abbasid
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Caliphate
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9) Rosetta, Blarney, Black
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Stone
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10) St Peters, St Marks, Notre Dame
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Basilica
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11) Newton, Murphy, Mendel
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Law
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12) Plymouth, Ayers, Gibraltar
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Rock
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13) Manifest, Oedipus, Endless
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Destiny
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14) Transcontinental, Pennsylvania, Trans-Siberian
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Railroad
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15) Yellow River, Great Mississippi, Johnstown
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Flood
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16) Great Chicago, Peshtigo, Iroquois Theater
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Fire
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17) Depression, Leap Forward, Expectations
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Great
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18) Silk, Abbey, Persian Royal
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Road
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19) Spice, Triangle, Trans-Saharan
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Trade
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20) Milvian, Golden Gate, Bering Land
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Bridge
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