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2014-01-09T22:51:21+02:00
49 | 7       49 = 7 la a 2
  7 | 7
  1 |

81 | 3       81 = 3 la a 4
27 | 3
  9 | 3
  3 | 3
  1 |
[ 49, 81 ] = 7 la a 2 x 3 la a 4 = 3969