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       1 x 9 + 2 = 11
      12 x 9 + 3 = 111
     123 x 9 + 4 = 1111
    1234 x 9 + 5 = 11111
   12345 x 9 + 6 = 111111
  123456 x 9 + 7 = 1111111
 1234567 x 9 + 8 = 11111111
12345678 x 9 + 9 = 111111111
123456789 x 8 + 9 = 987654321
 12345678 x 8 + 8 = 98765432
  1234567 x 8 + 7 = 9876543
   123456 x 8 + 6 = 987654
    12345 x 8 + 5 = 98765
     1234 x 8 + 4 = 9876
      123 x 8 + 3 = 987
       12 x 8 + 2 = 98
        1 x 8 + 1 = 9