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-1391 X N = R
-1391 X 1 = -1391
-1391 X 2 = -2782
-1391 X 3 = -4173
-1391 X 4 = -5564
-1391 X 5 = -6955
-1391 X 6 = -8346
-1391 X 7 = -9737
-1391 X 8 = -11128
-1391 X 9 = -12519
-1391 X 10 = -13910
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