computeValues(array, row, column)
   FOR count = 1 - 9
      IF !containsNumber(array, count, row, column)
         PRINT count

containsNumber(array, number, row, column)
   FOR count 0-8
      IF array[row][count] is number
         RETURN true
   FOR count 0-8
      IF array[count][column] is number
         RETURN true
   FOR count 0-2
      IF array[row / 3][column / 3 + count] is number
         RETURN true
   FOR count 0-2
      IF array[row / 3 + 1][column / 3 + count] is number
         RETURN true
   FOR count 0-2
      IF array[row / 3 + 2][column / 3 + count] is number
         RETURN true
   RETURN false