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A122469
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Write Roman numberals in increasing order: [I]=[1]; [I][V] = [1][5]; [I][V][X] = [1][5][10]; [I][V][X][L] = [1][5][10][50]; [I][V][X][L][C] = [1][5][10][50][100]; [I][V][X][L][C][D] = [1][5][10][50][100][500]; [I][V][X][L][C][D][M] = [1][5][10][50][100][500][1000]
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