1 x 1 = 1
11 x 11 = 121
111 x 111 = 12321
1111 x 1111 = 1234321
11111 x 11111 = 123454321
111111 x 111111 = 12345654321
1111111 x 1111111 = 1234567654321
11111111 x 11111111 = 123456787654321
111111111 x 111111111 = 12345678987654321
9 x 9 = 81
99 x 99 = 9801
999 x 999 = 998001
9999 x 9999 = 99980001
99999 x 99999 = 9999800001
999999 x 999999 = 999998000001
9999999 x 9999999 = 99999980000001
1 x 9 + 02 = 11
12 x 9 + 03 = 111
123 x 9 + 04 = 1111
1234 x 9 + 05 = 11111
12345 x 9 + 06 = 111111
123456 x 9 + 07 = 1111111
1234567 x 9 + 08 = 11111111
12345678 x 9 + 09 = 111111111
123456789 x 9 + 10 = 1111111111
1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321
9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888
9876 x 9 + 4 = 88888
98765 x 9 + 3 = 888888
987654 x 9 + 2 = 8888888
9876543 x 9 + 1 = 88888888
98765432 x 9 + 0 = 888888888
123456789 x 09 = 111111111
123456789 x 18 = 222222222
123456789 x 27 = 333333333
123456789 x 36 = 444444444
123456789 x 45 = 555555555
123456789 x 54 = 666666666
123456789 x 63 = 777777777
123456789 x 72 = 888888888
123456789 x 81 = 999999999
987654321 x 09 = 08888888889
987654321 x 18 = 17777777778
987654321 x 27 = 26666666667
987654321 x 36 = 35555555556
987654321 x 45 = 44444444445
987654321 x 54 = 53333333334
987654321 x 63 = 62222222223
987654321 x 72 = 71111111112
987654321 x 81 = 80000000001
999999 x 01 = 0999999
999999 x 02 = 1999998
999999 x 03 = 2999997
999999 x 04 = 3999996
999999 x 05 = 4999995
999999 x 06 = 5999994
999999 x 07 = 6999993
999999 x 08 = 7999992
999999 x 09 = 8999991
999999 x 10 = 9999999
1 = 1 x 1
1 + 2 + 1 = 2 x 2
1 + 2 + 3 + 2 + 1 = 3 x 3
1 + 2 + 3 + 4 + 3 + 2 + 1 = 4 x 4
1 + 2 + 3 + 4 + 5 + 4 + 3 + 2 + 1 = 5 x 5
1 + 2 + 3 + 4 + 5 + 6 + 5 + 4 + 3 + 2 + 1 = 6 x 6
1 + 2 + 3 + 4 + 5 + 6 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 7 x 7
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 8 x 8
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 9 x 9
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